Playing "Ditch 'Em" (i.e., "Ditch Them") on summer nights. Ditch 'Em is hide-and-seek on a large scale, played by kids in their early teens. We would put together two teams of roughly one to two dozen players each, and hide in any outdoor spaces throughout the neighborhood -- the streets, the sidewalks, front yards, back yards, whatever. One team would hide, one team would seek, and it wouldn't stop until all of the "hiders" were caught. It was always awesome, whether your team won or lost.
Ditch 'Em -- that's the name.