I am a karaoke fiend! What kind do you like? There's some bars around that do karaoke (don't know for sure about thursdays and they're mostly pretty sketchy places so I don't go to many) but there's also karaoke-only places where you get your own little room to sing your heart out in with your friends. There's two right across from Guildford Mall on 152nd, and they're open until midnight on thursdays, I think. They stay open to 1 or 2 on fridays and saturdays.