To donate to Riverside Park Programming, or to volunteer please call 212.870.3070.Summer on the Hudson programming is free to the public. Seating is limited, unreserved, and available on a first-come, first-served basis beginning 1-2 hours before the event. If there is heavy rain at the time of the event, the event will be cancelled. No rain dates are scheduled. If attendance reaches maximum capacity management reserves the right to close participation.