Clicking the Subscribe button on the Events page no longer works

[cwant]

Describe the bug

Clicking the Subscibe button on the events page is supposed to show a menu ("Subscribe via email", etc), but now it doesn't do anything.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://tess.elixir-europe.org/events
2. Click on "Subscribe"
3. The click in step 2 has no effect

Expected behavior

A menu should pop up with some options

Desktop (please complete the following information):

• OS: Ubuntu 24.04
• Browser chrome
• Version 130.0.6723.91 (Official Build) (64-bit)

Additional context

Noticed it wasn't working on my fork, confirmed it isn't working upstream too.