I would make sure to include board games and have people bring their Xboxes, Playstations and Gamecubes with them. People would have so much fun playing games that talk would come easier. I know this works for me as I tend to be less anxious if there's some activity going on that takes some of the focus off of my behavior. I think this is the very reason why I hate parties because there's nothing fun to do and my idea of enjoyment isn't chit-chatting or drinking.
Oh, and I would make sure there was plenty of good food, and not just paltry snacks. I'm talking pizzas, hot wings, tacos, hamburgers and other stuff that's supposed to be "bad" for you and let people, for once, forget that enjoying food is apparently a felony punishable by scorn and rejection. Oh, for those on gluten/casien-free diets, I would provide alternatives that taste as good as junk food yet keep them from having a reaction.
I would include music that's not turned up loud enough to make your ears bleed and unless the majority wants to, there would be no dancing. There would be access to computers available for internet or game play and a room that's made like a spa with candles (not scented), low light, comfy couches, books and "stimmy toys" so if people wanted to read or have quiet time to recover from overstimulation can escape. This way, they won't have to worry about leaving early or being tortured while waiting for their NT partner who hasn't had enough "fun" yet.
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"There is difference and there is power. And who holds the power decides the meaning of the difference." --June Jordan