Yes, you can set limits on the number of RSVPs for your event! When creating or editing an event, you'll see an option that says "Enable RSVP Limit". Toggle that button to "On" and enter the number of your maximum RSVPs into the "RSVP Limit" field.
Save the changes at the bottom of the Edit Event modal and you're all set!
Candidates will also see the limit when they RSVP, which creates a heightened sense of exclusivity and excitement about your event and ensures that you don't have more attendees than your conferencing system can handle.