Here's what Grant Park looks like after Lollapalooza clears the stages

Another Lollapalooza has come and gone, but Grant Park has a way to go before it's back to its old self. Between a weekend full of rain (on top of historic rainfall throughout the Chicago region this summer) and four days of more than 100,000 festivalgoers descending on the city, Downtown's biggest green space needs some time to rest and recover. Here are some bird's-eye views of the aftermath of one memorable weekend in Chicago's summer festival season. Aerial view of…