Vijay Iyer and Craig Taborn are at Roulette in Brooklyn on the 12th to celebrate the release of their duo piano CD. Advance tickets might be advisable. I’m often wildly wrong about these things, but Taborn’s last gig at The Stone had to turn people away.
The LiveCode.NYC folks are having an Algorave event in Brooklyn on the 13th.
I don’t know the Upper West side that well, so don’t have a specific recommendation, but I think you shouldn’t have a problem finding a pretty chill bar not too far from where you’re staying.
Have a nice visit!