Flashdrinks (com.ocdevel.flashdrinks) on Google Play
Think Meetup for drinks on the double. Ever want a drink when your friends aren't feeling it? Or, maybe some friends would be, but you didn't know to text them. Or heck, you'll even drink with strangers. With FlashDrinks you RSVP to a bar and send invites for friends to join you soon. Each bar listing has a chat room, who's coming, etc. Optionally, the RSVP callout can be public if you're willing to meet-n-greet.