Very niche but I would love to see dimension 20 do a Badge Quest campaign.
Badge quest is an RPG that's very simple and low stakes and would work really well in a format where people (including people with little to no rpg experience) could easily drop in and out of sessions on a more monster/mystery of the week basis, so you could have a large cast but not everyone would have to be in each episode.
The concept is that your character is a Blossom Scout and your goal is to sell as many cookies as possible with your troop, obviously encountering mysteries and mishaps along the way.
Instead of skills or levels you have "badges" (you start with some, and earn others through gameplay) and your characters are never in mortal danger but instead get into "scrapes", which instead of damaging your health, reduce the pool of dice you have available for your rolls (Skill, Toughness & Charm) until you basically just need to go home and recoup 😅
My point is it is very compelling, one-shots can easily last an episode length, and it could be dynamic and a way to involve even more dropout members who can commit to one or two episodes (alongside a couple of people that would be ideally in all/most of the episodes to provide some consistent characters) and help newbies get a flavour of rpgs.
The only flaw in my masterplan of course is that the system is D6 based, not a D20 I sight, so perhaps it would need to be it's own spin off...
