DS's 2nd birthday party planned for Sunday. Due to be held in the park (under trees). Weather forecast is showing 33 degrees, even in the shade. We've had grass fires around here previously. We have about 20 kids due to come and an entertainer booked. Would you go ahead, or cancel? One option would be to cancel and then just have, say, 3 kids at our house (we have a small north facing garden). Would that be awful?? Please advise as we are panicking!