I 'celebrated' it by doing a tiny bit of work on autistics.org. (Not really equipped to do much else right now.)
A friend of mine wrote this, which I posted for him:
http://www.autistics.org/library/autpride2005.html
I agree with much of it and was very happy that he wrote it, because I had been attempting to write something similar (not about Autistic Pride Day, but about the more general ideas in the article) for some time now, but not getting very far. Not even one sentence. So I am happy someone else managed to say it.
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams