An event for students just to have fun and get to know people. Possible prize for winning maybe just sweets or a voucher can charge £1-5 to play.

students given an area or building on the campus that has been opened up for the day or evening for the event and have to hide to show whose playing tags can be used like they are in capture the flag or bulldog.  
certain rules can be established before the event begins.

can just be one long event or timed smaller ones so people don't get bored