My kids' will be cleaning and doing chores on Saturday mornings and sometimes their friends from across the street will come over to play before they are done. 100% of the time the neighbor kids will ask if they can help them and then play.
They always finish the chores completely and it's a minor distraction but they all pitch in and things get done just as fast if not faster. I know my kids have made the same offer at their house.
Do your kids do this? My friends and I were the same way when we were little but my friend thinks the entire thing is strange and that kids should just do their own chores because "They aren't intended to be fun."