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.
To answer your first question, it is not possible at this time to add additional event types in the calendar. That has been an often-requested feature, but I don’t know when/if it will be implemented.
You can make recurring events with the volunteer-created Feature Assistant Extension, which is available if you are using Chrome or Firefox.
@JessicaMarshall1 - I recall that den meeting is available at the den level and there is campout at the pack level. I do leverage the other for well like other…