While I set up camp (folding chair and cooler for foot elevation) in the shade of the trees that border the field, Zac and the kids had to head to the hot middle of the field so the slight breeze wouldn't cause the rocket to land in the trees.
Here they are, ready to launch rocket #1 (which, due to an assembly mishap, would only get to blast off once).
Here's what things looked like from where I sat (although I could see the rocket a little better than the video implies).
The other rocket could be used over and over (until they ran out of fuel).
After the rockets were all spent, they came back to the shade for a picnic on Alice's new picnic blanket from Grandma Shogren. (I stayed in my chair with feet propped, but picnicked with them in spirit.)
Then, they enjoyed other field activities, such as chasing bubbles, flying kites, and throwing balls.