“It may indeed be impolite; I don't deny that. Whether it's untrue is a different question. - Eleizer Yudkowsky

Crocker’s Rules, named after and framed by Lee Daniel Crocker, are a social norm you can declare that you’re using where you authorize other people to optimize their messages for  information over niceness. In other words, by saying you’re operating by Crocker’s Rules, you’re saying you want people to say true things to you even if those things would be rude, in the interests of efficient communication. 

It can be uncomfortable and strange for some people to talk to someone using Crocker’s Rules! If you’re usually a polite person who tries not to make others upset, then saying the true and rude thing feels like being mean. Speaking impolite truths is a skill, and this meetup may offer a chance to practice that skill.

There’s another skill that some who flock to Crocker’s banner are not as practiced with. The ability to be polite and abide by local etiquette is a useful practical skill as well. We’re going to hopefully have a chance to practice that as well, and while it is less of an obvious rationalist skill, it’s one that’s worth having anyway.