This support article applies to RSVPify 1.0 and 2.0.
When setting up your guest list, you can select each guest who you would like to offer a +1.
1. Open your event.
2. Select Guest List.
3. On your right, select the number of guests within a given party, and click Add Party.
4. Use the checkbox to the right of each guest's name to allow that guest to bring a +1.