"The Chicago Park District has a long history and tradition of hosting amazing events within our beautiful parks for all to enjoy. For private events like Lollapalooza, in which attendees must purchase tickets, event organizers must pay to use park space. In certain circumstances, organizers of events that are open to the public enter into a partnership agreement with the Park District. In these partnerships, the event organizers do not have to pay a park rental fee because the event is determined to offer a public benefit."