diff --git a/ecc/blocks/event-info-component/event-info-component.css b/ecc/blocks/event-info-component/event-info-component.css
index 413e2229..a76ab279 100644
--- a/ecc/blocks/event-info-component/event-info-component.css
+++ b/ecc/blocks/event-info-component/event-info-component.css
@@ -11,6 +11,15 @@
   width: 100%;
 }
 
+.event-info-component sp-textfield#info-field-event-title sp-help-text {
+  position: absolute;
+  display: none;
+}
+
+.event-info-component sp-textfield#info-field-event-title.show-negative-help-text sp-help-text {
+  display: flex;
+}
+
 .event-info-component sp-textfield.textarea-input {
   font-size: var(--type-body-m-size);;
   width: 100%;
@@ -33,7 +42,7 @@
 .event-info-component .date-time-row > .date-picker {
   position: relative;
   border-bottom: 1px solid var(--color-black);
-  min-width: 280px;
+  min-width: 300px;
   display: flex;
   align-items: center;
   gap: 8px;
diff --git a/ecc/blocks/event-info-component/event-info-component.js b/ecc/blocks/event-info-component/event-info-component.js
index a938ee97..41db6aaf 100644
--- a/ecc/blocks/event-info-component/event-info-component.js
+++ b/ecc/blocks/event-info-component/event-info-component.js
@@ -1,5 +1,12 @@
 import { LIBS } from '../../scripts/scripts.js';
-import { getIcon, generateToolTip, decorateTextfield, decorateTextarea, convertTo24HourFormat } from '../../scripts/utils.js';
+import {
+  getIcon,
+  generateToolTip,
+  decorateTextfield,
+  decorateTextarea,
+  convertTo24HourFormat,
+  miloReplaceKey,
+} from '../../scripts/utils.js';
 
 const { createTag } = await import(`${LIBS}/utils/utils.js`);
 
@@ -94,7 +101,7 @@ export default function init(el) {
         generateToolTip(r);
         break;
       case 1:
-        await decorateTextfield(r, { id: 'info-field-event-title' });
+        await decorateTextfield(r, { id: 'info-field-event-title' }, await miloReplaceKey('duplicate-event-title-error'));
         break;
       case 2:
         await decorateTextarea(r, { id: 'info-field-event-description', grows: true, quiet: true });
diff --git a/ecc/blocks/form-handler/controllers/event-format-component-controller.js b/ecc/blocks/form-handler/controllers/event-format-component-controller.js
index d0f0951e..d12bd22b 100644
--- a/ecc/blocks/form-handler/controllers/event-format-component-controller.js
+++ b/ecc/blocks/form-handler/controllers/event-format-component-controller.js
@@ -1,6 +1,6 @@
 /* eslint-disable no-unused-vars */
 import { getSeries } from '../../../scripts/esp-controller.js';
-import { MILO_CONFIG, LIBS } from '../../../scripts/scripts.js';
+import { LIBS, BlockMediator } from '../../../scripts/scripts.js';
 import { changeInputValue } from '../../../scripts/utils.js';
 
 const { createTag } = await import(`${LIBS}/utils/utils.js`);
@@ -67,7 +67,7 @@ export async function onUpdate(component, props) {
   }
 }
 
-async function populateSeriesOptions(component) {
+async function populateSeriesOptions(props, component) {
   const seriesSelect = component.querySelector('#series-select-input');
   if (!seriesSelect) return;
 
@@ -84,6 +84,19 @@ async function populateSeriesOptions(component) {
   });
 
   seriesSelect.pending = false;
+
+  seriesSelect.addEventListener('change', () => {
+    const seriesId = seriesSelect.value;
+    const seriesName = seriesSelect.querySelector(`[value="${seriesId}"]`).textContent;
+
+    BlockMediator.set('eventDupMetrics', {
+      ...BlockMediator.get('eventDupMetrics'),
+      ...{
+        seriesId,
+        seriesName,
+      },
+    });
+  });
 }
 
 export default async function init(component, props) {
@@ -104,7 +117,7 @@ export default async function init(component, props) {
   const eventData = props.eventDataResp;
   prepopulateTimeZone(component);
   initStepLock(component);
-  await populateSeriesOptions(component);
+  await populateSeriesOptions(props, component);
 
   const {
     cloudType,
diff --git a/ecc/blocks/form-handler/controllers/event-info-component-controller.js b/ecc/blocks/form-handler/controllers/event-info-component-controller.js
index 4b6e042c..0ea0bd9e 100644
--- a/ecc/blocks/form-handler/controllers/event-info-component-controller.js
+++ b/ecc/blocks/form-handler/controllers/event-info-component-controller.js
@@ -1,6 +1,7 @@
 /* eslint-disable no-unused-vars */
 /* eslint-disable no-use-before-define */
-import { LIBS } from '../../../scripts/scripts.js';
+import { getEvents } from '../../../scripts/esp-controller.js';
+import { BlockMediator, LIBS } from '../../../scripts/scripts.js';
 import { changeInputValue } from '../../../scripts/utils.js';
 
 const { createTag, getConfig } = await import(`${LIBS}/utils/utils.js`);
@@ -345,14 +346,36 @@ export async function onUpdate(component, props) {
   // do nothing
 }
 
-export default function init(component, props) {
+function checkEventDuplication(event, compareMetrics) {
+  const titleMatch = event.title === compareMetrics.title;
+  const startDateMatch = event.localStartDate === compareMetrics.startDate;
+  const venueIdMatch = event.venue?.city === compareMetrics.city;
+  const eventIdNoMatch = event.eventId !== compareMetrics.eventId;
+
+  return titleMatch && startDateMatch && venueIdMatch && eventIdNoMatch;
+}
+
+export default async function init(component, props) {
+  const allEventsResp = await getEvents();
+  const allEvents = allEventsResp?.events;
   const eventData = props.eventDataResp;
+  const sameSeriesEvents = allEvents?.filter((e) => {
+    const matchInPayload = e.seriesId === props.payload.seriesId;
+    const matchInResp = e.seriesId === eventData.seriesId;
+    return matchInPayload || matchInResp;
+  }) || [];
+
+  const eventTitleInput = component.querySelector('#info-field-event-title');
   const startTimeInput = component.querySelector('#time-picker-start-time');
   const endTimeInput = component.querySelector('#time-picker-end-time');
   const datePicker = component.querySelector('#event-info-date-picker');
 
   initCalendar(component);
 
+  eventTitleInput.addEventListener('input', () => {
+    BlockMediator.set('eventDupMetrics', { ...BlockMediator.get('eventDupMetrics'), title: eventTitleInput.value });
+  });
+
   endTimeInput.addEventListener('change', () => {
     if (datePicker.dataset.startDate !== datePicker.dataset.endDate) return;
     const allOptions = startTimeInput.querySelectorAll('sp-menu-item');
@@ -386,6 +409,28 @@ export default function init(component, props) {
         option.disabled = false;
       });
     }
+
+    BlockMediator.set('eventDupMetrics', { ...BlockMediator.get('eventDupMetrics'), startDate: datePicker.dataset.startDate });
+  });
+
+  BlockMediator.subscribe('eventDupMetrics', (store) => {
+    const metrics = store.newValue;
+    const helpText = component.querySelector('sp-textfield#info-field-event-title sp-help-text');
+
+    helpText.textContent = helpText.textContent
+      .replace('[[seriesName]]', metrics.seriesName)
+      .replace('[[eventName]]', metrics.title);
+
+    const isDup = sameSeriesEvents?.some((e) => checkEventDuplication(e, metrics));
+    if (isDup) {
+      props.el.classList.add('show-dup-event-error');
+      eventTitleInput.invalid = true;
+    } else {
+      props.el.classList.remove('show-dup-event-error');
+      eventTitleInput.invalid = false;
+    }
+
+    eventTitleInput.dispatchEvent(new Event('change'));
   });
 
   const {
@@ -411,6 +456,15 @@ export default function init(component, props) {
     changeInputValue(endTimeInput, 'value', localEndTime || '');
     changeInputValue(component.querySelector('#time-zone-select-input'), 'value', `${timezone}` || '');
 
+    BlockMediator.set('eventDupMetrics', {
+      ...BlockMediator.get('eventDupMetrics'),
+      ...{
+        title,
+        startDate: localStartDate,
+        eventId: eventData.eventId,
+      },
+    });
+
     datePicker.dataset.startDate = localStartDate || '';
     datePicker.dataset.endDate = localEndDate || '';
     updateInput(component, {
diff --git a/ecc/blocks/form-handler/controllers/venue-info-component-controller.js b/ecc/blocks/form-handler/controllers/venue-info-component-controller.js
index 6d92b1d9..380ecd3e 100644
--- a/ecc/blocks/form-handler/controllers/venue-info-component-controller.js
+++ b/ecc/blocks/form-handler/controllers/venue-info-component-controller.js
@@ -1,6 +1,6 @@
 /* eslint-disable no-unused-vars */
 import { createVenue, replaceVenue } from '../../../scripts/esp-controller.js';
-import { ECC_ENV } from '../../../scripts/scripts.js';
+import { BlockMediator, ECC_ENV } from '../../../scripts/scripts.js';
 import { changeInputValue, getSecret } from '../../../scripts/utils.js';
 import { buildErrorMessage } from '../form-handler.js';
 
@@ -29,7 +29,7 @@ async function loadGoogleMapsAPI(callback) {
   document.head.appendChild(script);
 }
 
-function initAutocomplete(el) {
+function initAutocomplete(el, props) {
   const venueName = el.querySelector('#venue-info-venue-name');
   // eslint-disable-next-line no-undef
   if (!google) return;
@@ -97,6 +97,7 @@ function initAutocomplete(el) {
       changeInputValue(mapUrl, 'value', place.url);
 
       togglePrefillableFieldsHiddenState(el, false);
+      BlockMediator.set('eventDupMetrics', { ...BlockMediator.get('eventDupMetrics'), city: addressInfo.city });
     }
 
     if (place.geometry) {
@@ -118,7 +119,7 @@ export async function onUpdate(component, props) {
 export default async function init(component, props) {
   const eventData = props.eventDataResp;
 
-  await loadGoogleMapsAPI(() => initAutocomplete(component));
+  await loadGoogleMapsAPI(() => initAutocomplete(component, props));
 
   const { venue, showVenuePostEvent } = eventData;
 
@@ -178,6 +179,7 @@ export default async function init(component, props) {
     changeInputValue(placeIdInput, 'value', placeId);
     changeInputValue(mapUrlInput, 'value', mapUrl);
     changeInputValue(gmtoffsetInput, 'value', venue.gmtOffset);
+    BlockMediator.set('eventDupMetrics', { ...BlockMediator.get('eventDupMetrics'), city });
 
     if (venueName) {
       component.classList.add('prefilled');
diff --git a/ecc/blocks/form-handler/form-handler.css b/ecc/blocks/form-handler/form-handler.css
index 14f230c9..efb38db6 100644
--- a/ecc/blocks/form-handler/form-handler.css
+++ b/ecc/blocks/form-handler/form-handler.css
@@ -76,6 +76,16 @@
 
 .form-handler.show-error {
   --mod-textfield-icon-size-invalid: 16px;
+  --mod-textfield-border-color-invalid-default: unset;
+}
+
+.form-handler.show-dup-event-error #info-field-event-title  {
+  --mod-textfield-icon-size-invalid: 16px;
+  --mod-textfield-border-color-invalid-default: unset;
+}
+
+.form-handler.show-dup-event-error #info-field-event-title sp-help-text {
+  display: flex;
 }
 
 .form-handler .main-frame {
@@ -96,7 +106,6 @@
   justify-content: center;
 }
 
-
 .form-handler .side-menu,
 .form-handler .main-frame,
 .form-handler .form-handler-ctas-panel,
diff --git a/ecc/blocks/form-handler/form-handler.js b/ecc/blocks/form-handler/form-handler.js
index eabe5b68..f2cb1756 100644
--- a/ecc/blocks/form-handler/form-handler.js
+++ b/ecc/blocks/form-handler/form-handler.js
@@ -151,7 +151,7 @@ function getCurrentFragment(props) {
 }
 
 function validateRequiredFields(fields) {
-  return fields.length === 0 || Array.from(fields).every((f) => f.value);
+  return fields.length === 0 || Array.from(fields).every((f) => f.value && !f.invalid);
 }
 
 function onStepValidate(props) {
@@ -375,6 +375,21 @@ function showSaveSuccessMessage(props, detail = { message: 'Edits saved successf
   });
 }
 
+function updateDashboardLink(props) {
+  // FIXME: presuming first link is dashboard link is not good.
+  if (!getFilteredCachedResponse().eventId) return;
+  const dashboardLink = props.el.querySelector('.side-menu > ul > li > a');
+
+  if (!dashboardLink) return;
+
+  const url = new URL(dashboardLink.href);
+
+  if (url.searchParams.has('eventId')) return;
+
+  url.searchParams.set('newEventId', getFilteredCachedResponse().eventId);
+  dashboardLink.href = url.toString();
+}
+
 async function saveEvent(props, options = { toPublish: false }) {
   try {
     await gatherValues(props);
@@ -395,6 +410,7 @@ async function saveEvent(props, options = { toPublish: false }) {
   if (props.currentStep === 0 && !getFilteredCachedResponse().eventId) {
     resp = await createEvent(quickFilter(props.payload));
     props.eventDataResp = { ...props.eventDataResp, ...resp };
+    updateDashboardLink(props);
     onEventSave();
   } else if (props.currentStep <= props.maxStep && !options.toPublish) {
     resp = await updateEvent(
@@ -638,6 +654,7 @@ function initNavigation(props) {
 
   navItems.forEach((nav, i) => {
     nav.addEventListener('click', async () => {
+      if (nav.closest('li').classList.contains('active')) return;
       if (!nav.disabled && !sideMenu.classList.contains('disabled')) {
         sideMenu.classList.add('disabled');
 
@@ -654,21 +671,6 @@ function initNavigation(props) {
   });
 }
 
-function updateDashboardLink(props) {
-  // FIXME: presuming first link is dashboard link is not good.
-  if (!getFilteredCachedResponse().eventId) return;
-  const dashboardLink = props.el.querySelector('.side-menu > ul > li > a');
-
-  if (!dashboardLink) return;
-
-  const url = new URL(dashboardLink.href);
-
-  if (url.searchParams.has('eventId')) return;
-
-  url.searchParams.set('newEventId', getFilteredCachedResponse().eventId);
-  dashboardLink.href = url.toString();
-}
-
 function initDeepLink(props) {
   const { hash } = window.location;
 
@@ -750,7 +752,6 @@ async function buildECCForm(el) {
         case 'eventDataResp': {
           setResponseCache(value);
           updateCtas(target);
-          updateDashboardLink(target);
           if (value.error) {
             props.el.classList.add('show-error');
           } else {
diff --git a/ecc/scripts/utils.js b/ecc/scripts/utils.js
index a52c60f4..01744da4 100644
--- a/ecc/scripts/utils.js
+++ b/ecc/scripts/utils.js
@@ -125,7 +125,7 @@ function mergeOptions(defaultOptions, overrideOptions) {
   return combinedOptions;
 }
 
-export async function decorateTextfield(cell, extraOptions) {
+export async function decorateTextfield(cell, extraOptions, negativeHelperText = '') {
   cell.classList.add('text-field-row');
   const cols = cell.querySelectorAll(':scope > div');
   if (!cols.length) return;
@@ -153,6 +153,10 @@ export async function decorateTextfield(cell, extraOptions) {
     extraOptions,
   ));
 
+  if (negativeHelperText) {
+    createTag('sp-help-text', { variant: 'negative', slot: 'negative-help-text' }, negativeHelperText, { parent: input });
+  }
+
   if (maxCharNum) input.setAttribute('maxlength', maxCharNum);
 
   const wrapper = createTag('div', { class: 'info-field-wrapper' });
@@ -226,6 +230,24 @@ export function getServiceName(link) {
   return url.hostname.replace('.com', '').replace('www.', '');
 }
 
+export async function miloReplaceKey(key) {
+  try {
+    const [utils, placeholders] = await Promise.all([
+      import(`${LIBS}/utils/utils.js`),
+      import(`${LIBS}/features/placeholders.js`),
+    ]);
+
+    const { getConfig } = utils;
+    const { replaceKey } = placeholders;
+    const config = getConfig();
+
+    return await replaceKey(key, config);
+  } catch (error) {
+    window.lana?.log('Error trying to replace placeholder:', error);
+    return 'RSVP';
+  }
+}
+
 export function toClassName(name) {
   return name && typeof name === 'string'
     ? name.toLowerCase().replace(/[^0-9a-z]/gi, '-')