The Chicago in 2012 Worldcon bid, sponsored by Chicago Worldcon Bid, ran unopposed and at Aussiecon 4 won the right to hold the 2012 Worldcon, Chicon 7 in Chicago, IL Labor Day, 2012. (See 2012 Site Selection results.) It was chaired by Dave McCarty.
The Chicago in 2012 bid played around with its pricing structure, making it a little different from previous bids. The standard $20 membership did not reduce the attending membership cost to Chicon 7 when Chicago won. However, for anyone who donated at the higher "Friend" level, $20 of the membership was used by the bid with the remainder put into an escrow account to be used to convert the membership to a full attending membership for voting members when Chicago won.