This really sounds like a failure of the organizers more than anything- first off, lumping in non-binary is a catch all that anyone will take advantage of, and second and most importantly, everyone was complaining about long lines. Long lines means lots of people. Lots of people means the event over-sold their $600-$1000 tickets.
Sounds like the event organizers were more interested in making money than helping women in tech- women would have had the same problems had it been 100% women.
Edit: I’m not bashing non binary people, I’m just saying that people will take advantage of it, that’s all.