To invite guests to specific events:
Go to your wedding website settings
Expand your Schedule section
View your Schedule
Add an Event (or edit an existing one)
If this event is open to your entire guest list, you are done. Your guests will now be asked for their attendance of that event. Repeat for all events you would like to receive RSVP on.
Optional: If you would only like to ask some guests for their attendance for an event, you can turn on the Privacy setting, see below:
Then, you need to add each invitee to this new event. Go back to your guest list to edit the guest, then enable access