Originally Posted by ossuks:
90% and 70% chance of rain, lows in the 30s. HUGE purse to pay. What would you do if it was your money? 
With the forecast for Sunday being worse (rain/snow forecasted as far south as Springfield, IL) I would tend to fall on the side of calling the event and trying to book it earlier in the year. It's a great event, just bad timing and it's nothng against anyoen if this is indeed the only time of the year that everythng can be worked out to fit it on the schedule.