This weekends Jam will be held at Fredrick Douglas Circle Plaza. The picture below is of the spot.
Here's how to get there.
Take the B or the C train to the Cathedral Parkway 110th street stop. Once you walk out of the station you should see the giant circle in the middle of the road. That it.
Heres a pic
We will be staying here till 2pm at least so you'll have plenty of time to catch up.