I organized a few audio jams in Copenhagen. The basic idea is to bring together creative people interested in audio and music, and have them jam on a small task together. Participants received a B-movie trailer with the audio removed, then produced a new soundtrack.
Creative friends used traditional music tools, physical instruments (home-built or otherwise), recordings, or pure code to make interesting new sounds for the old film trailers.
The four (so far) jams have celebrated B-movie legends Roger Corman and Stephanie Rothman.
The resulting trailers can be viewed at the Cph Audio Jams youtube channel.