Alright, Im quite a way from Union Park, and I have no car.. BUT if some of you don't mind sleeping on the couches (I have 3 of them) and a air matress.. its all yours.
I've got room for about 5-7 people.
I live on Montrose and Ashland, Union park is Lake and Ashland:
If you have a car, its around a 20 minute drive, parking sucks.. I'm not far from wrigley field
If you have $2 you can take the train/bus to union park and it'll take around 45 mins.
Let me know.