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.
Historically, I believe that Patrol Admin allowed editing the patrol calendars and logs for the scouts assigned to that patrol in classic Scoutbook (and in SB+ after they were migrated). I’ve heard mixed reviews about whether that still works or not. They won’t be able to edit the troop-wide calendar with just the Patrol Admin role, though, so it depends on which calendar y’all keep the patrol events on.