If someone would give me a space and pay for my supplies I'd run a repair clinic for them and we could learn to solider try to take things apart and fix them.
But that would just help maybe two or three dozen kids and there are 100s.
And you need a variety of activities. Some of them might even want to work. We could have a math tutoring center and it could employ a few teens to teach elementary kids arithmetic. But, you'd need to pay someone to run that.