If you volunteer for 4 hours you can get in that day.  If you volunteer for two 4 hour shifts on two different days, you get a 3 day ticket.
*Please note that we very much appreciate your desire to volunteer. We ask that you understand that we require a $75 check or credit authorization to hold your volunteer space.  When you arrive for your shift, that Check or Authorization is returned to you.  This policy assure folks show up for their shift. Thank you for understanding.