I just went to my first one this Saturday, I was earnestly trying to find a group specifically not 'parents of' or teen heavy. I found a group listed on the Loyola Marymount site and emailed, thinking it might be a dead link but eventually someone answered and forwarded me the meeting flyer.
I felt weird just showing up and thinking I was being that guy, the dreaded Unannounced Visitor.
I was struck that it was a little 'too' informal at first; no name tags and nobody to walk me through. After about 20 minutes of light stimming I began to relax and realize I was among my people. At one point I commented on how the creaking hinge on the cooler tends to startle me someone thoughtfully explained the biological response behind it.
Anyway it was a good experience, good age range (I was approx in the younger 1/3), good mix of functionality, and it's not too far for me to attend as they rotate houses fairly close to me. Only things are it's only monthly, it's only a small region of a greater geographical area, and I'm still clueless about exchanging contact info
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Let's go on out and take a moped ride, and all your friends will thing your brain is fried, but you can't live your life too dirty, 'cause in the the end you're born to go 30