How to set the My Vaccine Pass Required status of an event:
With the configuration options enabled, when you add or edit an event, you are presented with an additional option on the right of the screen.
Tick the ‘My Vaccine Pass Required Event’ if you are needing people to present a valid pass to attend the event.
If you have a series of events - of which some require and others don't, then you will need to either set up a separate set of events, or edit the events that have a different status.