Enroll in a youth Parks & Recreation program Many Philadelphia Parks & Recreation activities require that a parent or guardian fill out and sign a Youth Participant Registration form to participate. Who Parents or guardians of youth under age 18. Work Phone: Where and when A variety of activities require a completed Youth Participant Registration form. Work Phone: How Follow these steps: Work Phone: 1 Download the Youth Participant Registration form. 2 Fill it out completely. 3 Return it, along with any other registration forms, to the Parks & Rec facility where the youth is participating. Forms & instructions Activities registration forms Related content Find Philadelphia Parks & Recreation activities.