Birthday Parties We’re looking forward to hosting your next birthday party at Prospect Gymnastics! Please email Malka or call 718-484-0911 to confirm details and dates before adding the $100 deposit to your cart. Gymnastics Party $450 Gymnastics party includes a 2 hour space rental, paper goods set-up and two supervising instructor for up to 12 children. Parents bring cupcakes / cake and drinks. Soft Play Party $350 Soft play parties are for children 4 and under. The event price includes a 2 hour space rental, paper goods set-up and one supervising instructor for up to 12 children.