I think the first experience playing is really important. The kids need to come out of it feeling confident that they can put their instruments together and make a good sound, even better if they learn a few notes.

 I have found that the fastest way to get everyone going quickly is through an event i call "Squeak and Squawk"

I bring in clinicians and have them introduce the fundamentals of care and sound production and get them playing their first note or two.

You can do this by yourself, but it takes weeks to accomplish what you can in a couple hours with more hands, and expert experience.