Like a college kid celebrating a birthday, we just don’t have one Halloween night this year, we have four. Starting tonight and running through Monday, the Boston area is flush with solid Halloween party spooktaculars, ranging from the usual cover shows to haunted house happenings to the bi-annual ManRay gathering (which is its own franchise at this point in Boston’s chilly alternative nightlife game). It’s impossible to capture everything that’s going on, but below are Vanyaland’s picks for what to do around town, particularly on a stacked-deck Saturday. There’s enough happening to wear that Eleven or Harley Quinn or Sexy Ken Bone costume several times over, and don’t forget, whatever happens this weekend, it’s only for fun. The real horror arrives November 8, so get in the good times while you can.