Creativity is good, though they are correct that each take different considerations. Most theaters will charge extra for showing the movie more than once 'cause that's time in their theater that could be used for something else, not to mention staffing needs. We've done a double feature before, and probably one of the biggest complications was getting the raffle done. We got through it though.
To me IDs are more of an individual event choice. I guess if there was to be a 'global design' created for people to use if they wanted that could register as something for everyone to take into consideration, but I surely don't think it necessary to require badges of all CSTS screenings and/or events.
The flyers last year pretty much fit this suggestion of mini-posters (can't remember year one's design off the top of my head), allowing for a decent amount of space to add individual event details. We did modify this year's as best we could for those purposes as well, and I think they can be posted easily in many places cheaply.