Cognitively I am fine. I really don't need extra time or anything.

It's just the overstimulation. Yes ear plugs are probably a good idea, what about trying to build up a tolerance for stimulation before hand?

I don't really get visually overstimulated either, sound is the real problem for me, and I'm pretty sensitive to jolts and stuff.

I can handle being in small groups of people fine but I have no idea about being around hundreds.