Show date/time of the session for session-linked videoconferences

For example in this event they have a session on multiple days in different rooms. It would be useful to show the date and time of the session block it's linked to so remote participants know which Zoom link to connect to.

No files or tests are named in the issue. Start by locating the rendering and data flow for session-linked videoconferences, then inspect how a session block's date, time, and room are represented. Done means remote participants can see the linked session's date and time, including for sessions spanning multiple days and rooms.

Written by the indexing model from the issue text.