Everyone who wants to be involved in the Crash Course Musical, Mamma Mia!, should stay for an hour after school on the first day to sign up, fill out contact information, and learn about it. Participants need to be ready to dedicate time over the next three weeks whenever they can. The commitment will be tiered, so if a student can only do two days, they’ll be placed in one number, while leads should be prepared for a full three-week commitment.