Protips:
Given both demographics and recent discourse, you are going to want vegetarian and vegan options for food.
HPMOR has a large hatedom, for various reasons. Key vectors for trolls are photos, videos, and flyers. Be more conscious than usual about personal boundaries and privacy.
Public events are going to bring together people with varying viewpoints; be emotionally prepared for having your bubble popped by culture shock.
Betting pools on the number of clueless attendees who showed up for the Potter and forgot about the Rationality are generally frowned upon by the general public. (That means you, Hanson!)
Don’t be gross, in either appearance or manners.
Don’t hand out pamphlets to the general public; it looks, you know...
For the interests of identity obfuscation, I have rolled a random number between 1 and 100, and have waited for some time afterwards.
On a 1-49: I have taken the survey, and this post was made after a uniformly random period of up to 24 hours.
On a 50-98: I will take the survey after a uniformly random period of up to 72 hours.
On a 99-100: I have not actually taken the survey. Sorry about that, but this really has to be a possible outcome.