Hello @TaniaF824 ,
At this time, there isn't a way to indicate or register guests via RSVP blocks. The best option would be to use the event tool if you need specifics on the guests. Otherwise if you don't need that many specfics, you can just make your third option in your RSVP for bringing guests - i.e. Not Attending, Yes I'm Attending, Yes I'm Attending and Bringing Guests. You can also utilize a poll block if you want to setup number options for guests.
If you'd like to add your feedback regarding this aspect of the RSVP block, I'd recommend voting and adding your idea to this Feedback thread.
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