Offer a 4th plan of payment for the Derby which includes choosing how many days per month one would like to use and pay for the Derby option. The person would commit to a certain number of days during each month that he or she would partake in the Derby. This would allow people to participate if they had some week days off during the month. The cost of the plan should be prorated based on the number of days one participates. Of course, one would maintain the real time plan as well. I would happily participate in 8 days per month in advance based on my fluctuating schedule as a nurse.