The cost of repairs was $453,000 this year, considerably more than last year's tally of $236,000, according to the Chicago Park District. C3 Presents, the promoter of Lollapalooza, which was held July 28-31, is responsible for paying the bill. The tab was far less than the nearly $1 million in repairs in 2011, when a 3-inch rainstorm soaked concertgoers on the final day of the concert.