So I called the Fun Match secretary earlier today and left a message that I won't be coming this weekend and why, believing that I was writing off my entry fees. However, just found this on the web:
Unfortuately due to the abnormal rainfall and the rain soaked fields the parks department has cancelled our use of the park. So the fun match will be postponed. We will be shredding your checks.
So I wouldn't have been doing agility on Saturday, anyway. Whew!