fix: Display issue with future sessions

[maximenowak]

Once the date of the next event has passed, the page won't change and keep the same previous sessions and future sessions.

Find out why the page won't update itself.

i.e. :
On August 28th, Venkat session is displayed and next session is Hans-Peter.
On September 4th, Venkat session is still here (should be removed) and Hans-Peter is still in furture sessions (should be next session)