Maybe a big party or convention would be a better idea than a jam session. Whenever you see one of those big all-star musician jams on TV it usually sounds like a big jumbled mess! An interesting idea, though...

The way everyone is spread out would make that impossible.But something that could be interesting would be a 2 minute rhythm track that is the same for everyone and each person could lay down something over it and show there own individual style of playing. Just like famous artist lay a solo on someones track but doing it there home without even sometimes even meeting the artist who's track they even performed on. Something to this liking could be interesting.