If you want to set a registration closing time for a 1-1 Live event, go to Live > 1-1 Bookings > Create/Edit a Live > 1-1 Booking Details tab and click Additional Settings

If the time is left at zero (its default value), registration will remain open until the end of the live session. Alternatively, if you specify a time, registration will be closed to individuals attempting to register after the designated time.

Eg: If you enter 30 Minutes, people can register for the event half an hour prior to its scheduled start time.
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Multiple Session:
In the case of Multiple Schedules, the same registration time limit applies to all schedules, and there is no possibility to set different registration availability times for each schedule. However, people can join the session using the direct join link.

Recurring session:

If the registration time limit is set, the time set is applicable to the first session of the recurring. To join the other sessions, people need to use the direct join link.