I was looking downtown for the same weekend and could not get anything at a reasonable price. We are planning on taking the El into town from O'hare, supposedly a 15 min ride, 24/7 including holidays, and the hotel we got is just a few blocks from the El stop...even if it wasn't we thought we'd take a cab to the stop then take the train...cheaper than cabbing it all the way downtown. I had previous attempted PL for 1* in downtown (loop, nma, rn..I think) 5/26-5/29 for $40 and did not get any takers. Good luck.