Your ideas sound great. I'm glad you're helping people find resources.
The only other thing I could think of would be some sort of useful info for families who aren't affected by autism directly, but who know someone who is. For example, a mom who takes her kid to the playground who regularly encounters another mom with a child with autism. Or the parent of a child who's in a school class with a child with autism. Or the neighbor of a family with a child or children with autism. There could be helpful info, like what autism is (and what it isn't), how to talk with your child about his classmate, how to interact socially with a child with autism, etc.
I think that many parents who have a child with special needs, or a disease, or a diagnosis of any type, wish that there were ways to help neighbors, classmates, relatives understand the family's struggles. They wish that others knew they're a regular family with an additional issue to deal with but they still want to be included in events. They want others to know it's not contagious, and it's not because they didn't give their kid enough vegetables or because they let their kid watch cartoons or because they don't eat organic food exclusively.
I'm just thinking of all the people at the fair who won't need autism services directly, but who could use some education and information from a reliable source. There's too much bad info out there, and too many accusations. You could help spread true and accurate info.