If you want a wide game that’s easy to play and doesn’t require half an hour to explain the rules, try team handball. It’s really simple and anyone can play.
All you need is two soccer nets and a ball. (You may also want pylons to mark the goalie’s crease.) A ‘gator skin’ ball works best: it’s soft and squishy so head shots don’t hurt so much, but it has enough weight that you can throw it with power. The distance you place the nets apart depend on the size of your group. Try 75 feet for 20 people and 200 feet for 100 people. The goalie’s crease should be a half-circle around the net with 15 foot radius – maybe a bit smaller if you have younger players. You will need two teams – each with a goalie.