Personally, I feel a lot more comfortable with physical closeness if I believe it won't turn into something sexual

sex causes a lot of problems...

It's hard for me to imagine how LW gatherings will turn into that kind of space

Indeed. My only hope is that it seemed to work at the minicamp.

But I'm also not sure how to get people to be honest about their boundaries. I was in one such group of mostly liberal North Americans who were fine with hugging and cuddling, but the one Bangladeshi guy was worried sick his parents would find out he had hugged girls. And there wasn't a comfortable way for him to tell us that until he knew us better.

I worried about this a little bit. This is why it is crtitical that it be opt-in. Crocker's rules doesn't seem to have this problem (people opting in when they are not ready), so perhaps it is possble to not fail this way.

Worth testing at least.