cFadden’s seems at first glance like your typical Faneuil Hall-area bar with overpriced Sam Adams and a crush of aging frat brothers and gum-chewing coeds. Until you walk downstairs. There, in the basement, is an old bank vault complete with deposit boxes and a giant door welded permanently open. It’s a whole other bar, and it’s usually open only for private events, but you can grab it for free in a relatively easy-to-win raffle for an after-work party from 8 p.m. to 10 p.m. with cheap beer and mixed drinks and a DJ. Partygoers can kick back in relax in the booths or at the small tables and ottomans and watch their coworkers make fools of themselves on the dance floor. Cassis