Adult Swim has canceled tonight's fan experience event at Veterans Park, citing threatening weather conditions that will make it an unsafe and uncomfortable viewing environment.

According to a post on the event's Facebook page, pre-purchased tickets to the Milwaukee event will be honored on Thursday, June 28 at the Chicago tour stop. Refunds are available by emailing order-support@FrontGateTickets.com with your order number.

The tour is technically free to attend but requires the purchase of a $10 voucher good for a free popcorn and a small soda.

Adult Swim is Cartoon Network's adult-oriented, nighttime programming block. The 18-and-older On the Green Tour is an in-person live event that includes games, a beer garden, free screenings of never before seen pilots, unaired Adult Swim episodes and more.