I'm with you. But if I'm already at a major match I will shoot in the rain and mud before waste my vacation days, fuel money, hotel fees, match fees ect.
My choice is good rain coat that goes down at lest mid thigh, a ball cap, water proof foot wear and water proof gun cover (a cheap shower cap). Side note, you can find cheap shower caps in the African american hair care product section in walmart. I think I paid less than $3 for a bag of 20 shower caps. Also, if your cleats aren't water proof you could always take hobo route with putting plastic bags over your socks before you put your cleats on.