Club De Fromage is probably one of the cheesiest clubs in London. Every Saturday is dedicated to cheap beer, silly costumes, and music they can sing along to whilst eating a kebab. The club is run by Fat Tony (no, not the guy off The Simpsons), who runs the establishment in an old disused meat refrigeration plant (what, you were expecting a cheese factory?) in Islington.
If that venue doesn't quite do it for you, then don't worry, their fancy dress nights are actually held at the slightly more prestigious O2 Academy Islington. Tickets cost £8 on the door or £6.50 when booked in advance; students can also get discounts if they have a NUS card.
The party starts at 10.30pm, and each week has a different theme, so you will no doubt find something that suits (sorry about the pun).