I would have no problem with neighborhood kids using that land to have fun. Heck, a nice gazebo and giant playset would be great.
I’m not sure about the tents and organized football with coaches. I’d have to see how it goes to see if it would become a problem with extra traffic, parking, trash, etc… But if everyone was respectful to surrounding property and behaved themselves I’d take a chair out there and cheer the little buggers on.
When we were kids it was touch football on the cement street and tackle on the grassy sides. It was adventure football.
Oh, and…
CAR!