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How to experience autistic culture 
Realize that autistic people make autistic culture-neurotypicals don't. 
If autistic people don't have a clear voice in an autism organization or event, then it is probably not a good place to find other autistic people. It may also be a source of inaccurate, pitying, or hateful material.
If an organization is run partially or completely by autistic people, its about page will usually say so. See if it is partnered with any autistic-run organizations.