Activity: A semi-regular, semi-organized movie night aimed at allowing wardens to de-stress from a stressful job, socialize a bit and potentially share bits of their cultures with each other. Maybe just throw popcorn at each other. Any wardens are welcome, presumably not all will be there on any given night, since the inmates probably shouldn't be left totally unsupervised for a few hours, they can swap out if there's enough interest, Lucifer won't have to be there every time so Grace the others can have some fun time without him :P Also a different person can pick the movie each time (Lucifer will pick the first one) - they can set up a rotation or whatever if necessary. A good chance to have characters talk about each other's worlds a bit!
Location: The theater in Warden Command
Frequency: idk once a week or once every couple of weeks probably, it doesn't have to be set in stone
Availability: Starting out as a socialization opportunity for wardens only, but hey if eventually somebody wants to figure out a way to bring along an inmate as a reward for good behavior or something why not. Also Lucifer would not try to keep it a secret though he obviously won't be talking it up to inmates, so...if you think your inmate character would reasonably know about it or find out somehow, GO FOR IT