Suit up and pick a side for what might be the largest space battle to ever arrive in San Jose. On Saturday, April 30, St. James Park will play host to the charitable Cats in Space space battle benefiting the Make-A-Wish Foundation.

Nevermindspace is a Toronto-based company that seeks to bring excitement back to public spaces by promoting free, all-age events such as pillow fights, bubble blowing parties and subway celebrations. Last December, the city of San Francisco saw more than 10,000 people battle it out in the pouring rain using glowing weapons on the sides of good and evil. This massive event broke the world record for the largest light saber battle. Inspiration for the event came from childhood memories, says Kevin Bracken, co-founder of Nevermindspace.

“The whole point of the event is to create something that is fun and free for everyone,” he says.

This year a percentage of all reservations made for the San Jose event will benefit the Make-A-Wish Foundation. Bracken credits the partnership as a direct link to what the battle is all about—giving people the opportunity to recapture that childlike excitement. The mission is to raise $20,000 for the foundation.

Due to a naming rights snafu with a small company named Disney—ever heard of it?—the tour had to change its name from “The Light Battle Tour” to “The Cats in Space Tour.”

Participants are welcomed and even encouraged to dress up in cat ears and whiskers or their favorite pop-culture characters. Inspired by the huge success of last year’s event, despite the rain, organizers hope a sunny day in San Jose will make this year’s event an out-of-this-world experience.