The formula is simple yet complex. If officers are used, they have a wage formula. If TCO's or metro parks are needed, it is based on their salary. If barricades or other equipment, you see the point. Also, if event organizers leave a mess behind and parks has to come in and clean up, big fines. You can see why they call the LT's in special ops who are this, wedding planners with badges. I believe there were over 2000 requests last year alone.