Yes, as an organiser you can restrict attendees entry for a particular session by using the "Control who can join" session.


Kindly refer to the help article - Control who can access your event session (restrict session-based entry)



Restrict other attendees from the session. Only a host and co-host have these rights. 

If they find someone spamming/abusing, they can report the person and then the host can block them.







.