School Library Journal has an interesting article about OST, out-of-school time, which is a school term that directly asks places like public libraries to offer quality programs for children outside of school.  I like that the emphasis is on providing fun for school-aged children.  Many public libraries are already doing this sort of programming.  In fact, I did exactly this sort of thing years ago in the first public library I worked in.  Quality time and programming for latchkey children.