If you're looking for something unique to do on a 1st or 3rd Thursday of the month I can highly recommend Frances Farmer Organ Karaoke at Vermillion Gallery on Capitol Hill. This is no ordinary karaoke. You are backed by a live organ and you can sing with a microphone or megaphone or both, or neither, anything goes here!
I tried it out last night and was impressed! The organ even broke down but some random person went home and brought back their Casio keyboards and the night continued!
Check out their website or Facebook page for more information!