The RSVP function is enabled in group type settings, making RSVP features available to any groups within that type. All RSVP features are tied directly to a group. That means you must have a group created before you can use RSVP. The group doesn't need to have any members, but it needs to exist so individuals who accept your RSVP can be added to it. To enable RSVP for a group type, navigate to Admin Tools > Settings > General > Group Types and open the RSVP section for the group type. Enable RSVP - Turn this switch on to access RSVP features for any group of this type. Once it is on, the other two fields related to RSVP will appear.RSVP Reminder Communication - Select the System Communication that should be used to send reminders to invitees who have Accepted. Only communications in the “RSVP Confirmation” category will be available for selection. This field is required, and the selected communication is used with all groups of this type.RSVP Reminder Lead Time - Indicate how many days (0 to 30) before the event the reminder should be sent. Like the communication selection, you won’t be able to change the lead time for individual groups if you set a value here. All groups of this type will inherit the lead time set at the group type level. Set this to '0' days if you instead want to manage the reminder lead time on each group individually.