Complete the following sentence: Chicago has had previous experience with Olympic bids. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️
1904 World's Fair. Chicago also bid for the 1952 and 1956 Summer Olympics, without success. 2008 Summer Olympics <unk> on May 15, 2006, where he collected information on hosting. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️