The two tied the knot June 22 at Skywalker Ranch in Marin County, Calif., but chose to celebrate Saturday with a reception a week later in Hobson's native city, The Hollywood Reporter said.
Music for the reception was provided by Prince and his 22-piece band at the park, which was closed off for the event.
"They wrote a check to the city for the whole thing," said a police officer on duty at the reception.
Actors Robin Williams and "Star Wars" star Mark Hamill were spotted at the event, along with Chicago Mayor Rahm Emanuel, "Today's" Al Roker and Grammy winner Ne-Yo, the entertainment industry publication reported.
Guests staying at the Chicago Peninsula Hotel for the reception were treated to a gift bag that included some of Lucas and Hobson's "favorite local favorites," including chocolate cookies from Carol's Cookies, popcorn from Garrett Popcorn and Marshall Field's Original Frango Mints, The Hollywood Reporter said. The gift bags also included novelty items from Skywalker Ranch.