Guesses Halloween 2017 event!

An event in which aliens, zombies, and characters from the Simpson fight SideshowBob's family while engaging in competitions of a made up sport such as "Tap-ball" while other parallel dimension and time traveling characters are entertained by a sing-off competition while also attacking each others' castles made of recyclables and hiding from spies who travel around the world from the airport digging up ancient artifacts and researching the origins of superhero myths which were created by the Stonecutters who also whack snakes and like to gamble at Burns Casino which they ride to on a monorail built from trash collected in Springfield Heights.

Oh, and a prize wheel.