The answer to 1) is very likely yes as this was the case at previous EAG events in the UK. Whatever rules there are for newbuilds obviously a) don’t apply to existing buildings (and the venue is not a new built) b) don’t have any influence on how you use or label bathrooms at private events (unless you are discriminating or something which I assume CEA isn’t planning to do).
The answer to 1) is very likely yes as this was the case at previous EAG events in the UK. Whatever rules there are for newbuilds obviously a) don’t apply to existing buildings (and the venue is not a new built) b) don’t have any influence on how you use or label bathrooms at private events (unless you are discriminating or something which I assume CEA isn’t planning to do).