Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
If you have the RSVP option toggled on, when the reminder goes out from Scoutbook, the reminder reminds you to RSVP and includes a link to do so. You can set Scoutbook to send multiple reminders and you can turn the RSVP option off once your deadline date has arrived so that subsequent reminders to not include the RSVP link.
This is what scouts, parents, and leaders received when I had Scoutbook send out a reminder for our Court of Honor but had the RSVP option toggled on"
Thanks. We expected that if you set the RSVP that it would send out an email requesting the RSVP. Now I know that I need to set a reminder to get email to go out.