You can definitely extend the party itself (not including the food) an extra hour for free, I believe. I definitely know extending the food costs extra, but I'm not sure on the price.
Thanks everyone I'm going to email our planner and see if we can extend it Our party is currently 8.30 til 9.30 - do you think we can extend it to 10pm or can you only add time beforehand??
That is exactly what we did. I think we paid an extra $5-6 pp to extend the party 30 mins. It was so worth it imo because the show itself is 20 mins so i wanted the party to be at least an hour of mingling.