masks at masquerade nights, do you keep them on the whole night or is taking it off the actual moment

me and the wife have done about 4 masquerade themed nights now (london, manc, one in dublin) over the last 18 months and ive been quietly fascinated by the etiquette of the mask itself. like the obvious bit, you put it on at arrival, it makes the room feel cinematic, you spot a couple you like, etc. but then theres this whole language of when the mask comes off and what it means. ive seen ppl keep theirs on right thru play. ive seen ppl take theirs off before play starts as a sort of "this is the real me" gesture. ive seen masks come off mid-conversation when things get serious between two couples, like a small signal of "ok lets actually do this". and ive seen ppl who never take it off the whole night and leave with it still on which i thought was a bit much honestly but each to their own. is there an actual code here or is everyone just making it up as they go. and is it bad form to keep yours on during play with another couple if theyve taken theirs off, like is there an implicit "if you take yours off i take mine off" thing. also masks themselves, is it weird to take them OFF for the photo bit at the start and then put them back on, or are you meant to be masked from the second you walk in. asking bc i quite like ours and i want to get the etiquette right rather than blunder thru it again