text: Title: Cannot move session to another day
  Body: **Is your feature request related to a problem? Please describe.**
  In https://indico.cern.ch/event/1381446/ I had a session scheduled on Wednesday and wanted to move the whole session to Friday. Strangely I could edit the start and end **times** of the session but not the day.
  ![Screenshot from 2024-06-17 09-12-26](https://github.com/indico/indico/assets/14927192/6460dec6-4a3d-4831-badf-76c8ea657ce9)
  
  **Describe the solution you'd like**
  I would like a calendar next to the starting times. 
  
  **Describe alternatives you've considered**
  Instead I created a session on Friday and moved the talks to this new session one-by-one. That works for 5 talks, but can be painful when there are 20.
  