Does anyone have this worry if you are hosting a birthday party outside? Both my kids have summer birthdays, and I was thinking about renting a pavilion at one of the public playgrounds and letting all the kids run and play. But I'm worried about possible rain and the fact that if it rains, the pavilion is nonrefundable. If you have hosted an outside party, did you have a backup plan in case of rain, or did you just hope for the best? Any success or horror stories you would like to share?