Hey, the 80s are fashionable again (ask Franz Ferdinand), how about an 80s "B" movie allnighter, there are so many to choose from:
There are the "respectable" ones - The Thing, Mad Max, The Terminator, RoboCop
And then there's the nerdy ones - Battle Beyond the Stars, Outland, Buckaroo Banzai, Flash Gordon, They Live (a John Carpenter night on its own could be cool)
And then there are those for the real cognescenti - Trancers (I'd love to see that on the big screen - hell there are that many sequels, you could do a whole festival - it'd be rubbish, but you could), Robot Jox (I saw someone trying to sell a vhs copy of this for Â£200!!!), Iceman, Strange Invaders
Then there are the really quite poor, but y'know, almost funny - Inseminoid, Spacehunter, The Blob (remake), Monkey Shines
Oh and, for those of us with boring stuff like families and stuff that make staying out all night a thing of the past, how about an "all-dayer" - I'd happily skip work but getting round the wife is tougher.