Yes, this is possible.
This is useful if you are e.g. organizing a dinner and need to limit your total guest count to 80.
1. Where can the guest limit be set?
The guest limit can be set on the tab REPLY PAGE under "Reply options" (Screen blow)
This feature is only supported for Single invitations.
(At the moment it is not possible to set limits for single invitations within the multi invitation product.)
2. What do my recipients/guests see if the limit is reached?
Once your limit is reached your guests will see a message and will still be able to contact you via the message box. (Please see Screen below)
SCREEN 1: Where to set the Guest limit:
SCREEN 2: What do your recipients see if the limit is reached: