They frowned upon us when we took over a meeting room at lunch time and put PES on a projector (the console and projector belonged to us)... The guy who brought them in actually got told off (but that might have been because he was a bit of a slacker generally)
The other option is to bring in a bunch of DS handhelds. We've done that too. There's a pretty large list of games that only need one cart (i.e. Bomberman
