The No-Pants Party: Tommie Sunshine

This party is notable in that you'll get free entry if you arrive free of trousers—though, in the interest of staying on the right side of public-decency laws, you should probably cover your nether regions with a little something. It's also notable for the presence of headliner Tommie Sunshine, spinning a rock-remix-heavy set of buzzy beats. Go to pachanyc.com to get on the reduced-admission list.