Gatsby has a +1 functionality that allows guests to bring one (or more) guests, depending on how the invite is structured.

In the RSVP tab of the Events Dashboard, on the right-hand side users will see “Allow guests to invite additional guests?”. Depending on whether this is filled out will depend on whether guests can be allowed.

If the event allows Additional Guests, the original guest will get a question on the invitation on whether they want to bring a guest.