We know we're saving up our money for countless Halloween-themed events this weekend, so tonight we're all about the free stuff. Funcheap SF is an e-mail newsletter that clues in the city's under-employed, bored and frugal on the best in fun and cheap stuff to do. Tonight they're hosting the Cheap Bastard Fun Happy Hour at EZ5 Bar(682 Commercial St. at Kearny near the Holiday Inn in Chinatown). The event will feature cheap happy......