My son starts Reception in September, and his birthday is end of September. We'd love to have a big birthday party for his whole class (30 kids) plus other friends and have found a really good trampoline park deal (food included) on a Saturday, but it's 4-5:45pm. Is that too late? It's almost twice the price any earlier in the day but I guess this is a less popular time so it's a good deal. What's a normal time for a 5 year old's birthday party? Also, do parents tend to stay? I'd be a bit worried about supervising all those kids on my own so would want backup!!