revising my lame o answers kiddo says chardes is way cooler.
someone suggested the 500 game-- I remember playing something, there was one person with a ball, and everyone else was assigned a number by a grownup or the oldest player, the numbers were chronological so if there were 9 other players one was 1, the next was #2 and so on. everyone gathered around the ball person, then the person with the ball tossed it up in the air, simutaniusly calling out a number 1-9 ( I guess you might need to tell them outright what the highest number is if they don't know to count players) Everyone Scatters when the ball is thrown The person whose number is called has to catch the ball, (they have to freeze where the catch it) and i think they need to yell stop so others quite moving. then the person with the ball throws it at the feet of anyone else, if the person catches it they are safe, if it misses them they are safe, if they get hit with the ball they have to be the one to toss the ball in the air and call out a number. whew complicated but fun,.
you could google to find rules on these
my first sthought was 4 ssquare you draw 4 equal boxes with chalk on cement, four people each get one square, then bounce the ball into the square and ther person has to bounce it to a differnent square , not sure of all the rules.
Kickball sounds great for your crowd.
You could also take crafts and teach them to knit or crochet.
have fun!!