clubs with a registration time limit

[annadaa]

Is it possible to add a limited time to join a club?

also a club life and then archive it?

The advantage of a time limit for registrations allows a better call to action to start a group collaboration session on a given time from a fixed date.

for example a registration to join a group limited to 5 students. Registration takes place from 08/01/2020 to 08/20/2020. The duration of the session is from 01/09/2020 to 31/12/2020.

[Joel R]

There's no in-built feature.

As a workaround, you can include a Club Calendar (or simply post on your Community Calendar).  The Club Leader or Moderators can set beginning and ending dates, and then use those to trigger warnings for themselves.