FIREWORKS!
When all was said and done, when the sun had gone down and the night was as dark as it was going to get, the residents of Xavier's School were, for the most part, well-fed, exhausted, and very, very dirty. And that meant it was time to lie back in the grass, relax, and watch the fireworks.
Hank had figured that Jubilee would just put on a tiny fireworks show, but she'd insisted that it be "grand and massive," so he was letting her run the show, and letting her show off as much as she wanted.