Visiting the Logan Square address at is actually a two-fer. Walk in downstairs and Slippery Slope promises a party night of dancing, DJs, a great beer selection, cocktails in bottles, Skee-Ball and raucous fun. Drinks are inexpensive, cash and credit card accepted. Did we mention that Slippery Slope is THE place for dancing in Logan Square? Upstairs, Heavy Feather offers a laid back but nonetheless happy 1970's vibe (not that anyone in the place was drawing breath in the 70's). You can have a conversation with a new friend you met dancing downstairs serenaded by Bowie, Fleetwood Mac and Stevie Wonder. Every Monday is a music happy hour that changes each week with different 70s artist.