'Parade school' for Thanksgiving volunteers

July 20, 2010 8:29:21 AM PDT
A thousand volunteers learned Saturday how to operate the giant inflatable balloons that will be part of Chicago's upcoming Thanksgiving Day Parade.Organizers call Saturday's event outside the Museum of Science and Industry "parade school."

Tens of thousands will gather on State Street for the Thanksgiving Day Parade, which will celebrate its 75th anniversary this year.