diff --git a/app/models/session.rb b/app/models/session.rb
index f2332a621..91332caaf 100644
--- a/app/models/session.rb
+++ b/app/models/session.rb
@@ -40,6 +40,7 @@ class Session < ApplicationRecord
   belongs_to :location, optional: true
 
   has_many :consent_forms
+  has_many :dates, class_name: "SessionDate"
   has_many :patient_sessions
 
   has_and_belongs_to_many :immunisation_imports
diff --git a/app/models/session_date.rb b/app/models/session_date.rb
new file mode 100644
index 000000000..cf8cf9011
--- /dev/null
+++ b/app/models/session_date.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: session_dates
+#
+#  id         :bigint           not null, primary key
+#  value      :date             not null
+#  session_id :bigint           not null
+#
+# Indexes
+#
+#  index_session_dates_on_session_id            (session_id)
+#  index_session_dates_on_session_id_and_value  (session_id,value) UNIQUE
+#
+# Foreign Keys
+#
+#  fk_rails_...  (session_id => sessions.id)
+#
+class SessionDate < ApplicationRecord
+  audited
+
+  belongs_to :session
+
+  validates :value, uniqueness: { scope: :session }
+end
diff --git a/db/migrate/20240925075935_create_session_dates.rb b/db/migrate/20240925075935_create_session_dates.rb
new file mode 100644
index 000000000..a3ffd6d2d
--- /dev/null
+++ b/db/migrate/20240925075935_create_session_dates.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+class CreateSessionDates < ActiveRecord::Migration[7.2]
+  def change
+    # rubocop:disable Rails/CreateTableWithTimestamps
+    create_table :session_dates do |t|
+      t.references :session, foreign_key: true, null: false
+      t.date :value, null: false
+      t.index %i[session_id value], unique: true
+    end
+    # rubocop:enable Rails/CreateTableWithTimestamps
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 71de457e1..9d4dd01e2 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2024_09_24_140304) do
+ActiveRecord::Schema[7.2].define(version: 2024_09_25_081048) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -461,6 +461,13 @@
     t.index ["vaccine_id", "programme_id"], name: "index_programmes_vaccines_on_vaccine_id_and_programme_id"
   end
 
+  create_table "session_dates", force: :cascade do |t|
+    t.bigint "session_id", null: false
+    t.date "value", null: false
+    t.index ["session_id", "value"], name: "index_session_dates_on_session_id_and_value", unique: true
+    t.index ["session_id"], name: "index_session_dates_on_session_id"
+  end
+
   create_table "sessions", force: :cascade do |t|
     t.date "date"
     t.bigint "location_id"
@@ -629,6 +636,7 @@
   add_foreign_key "programmes", "teams"
   add_foreign_key "programmes_sessions", "programmes"
   add_foreign_key "programmes_sessions", "sessions"
+  add_foreign_key "session_dates", "sessions"
   add_foreign_key "sessions", "teams"
   add_foreign_key "triage", "patient_sessions"
   add_foreign_key "triage", "programmes"
diff --git a/erd.pdf b/erd.pdf
index 48c948d45..a5ff1478f 100644
Binary files a/erd.pdf and b/erd.pdf differ
diff --git a/spec/factories/session_dates.rb b/spec/factories/session_dates.rb
new file mode 100644
index 000000000..fe00a034f
--- /dev/null
+++ b/spec/factories/session_dates.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: session_dates
+#
+#  id         :bigint           not null, primary key
+#  value      :date             not null
+#  session_id :bigint           not null
+#
+# Indexes
+#
+#  index_session_dates_on_session_id            (session_id)
+#  index_session_dates_on_session_id_and_value  (session_id,value) UNIQUE
+#
+# Foreign Keys
+#
+#  fk_rails_...  (session_id => sessions.id)
+#
+FactoryBot.define do
+  factory :session_date do
+    session
+    date { Date.current }
+  end
+end
diff --git a/spec/models/session_date_spec.rb b/spec/models/session_date_spec.rb
new file mode 100644
index 000000000..ce53c6b3e
--- /dev/null
+++ b/spec/models/session_date_spec.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+# == Schema Information
+#
+# Table name: session_dates
+#
+#  id         :bigint           not null, primary key
+#  value      :date             not null
+#  session_id :bigint           not null
+#
+# Indexes
+#
+#  index_session_dates_on_session_id            (session_id)
+#  index_session_dates_on_session_id_and_value  (session_id,value) UNIQUE
+#
+# Foreign Keys
+#
+#  fk_rails_...  (session_id => sessions.id)
+#
+describe SessionDate do
+  subject(:session_date) { build(:session_date) }
+
+  it { should be_valid }
+end