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its a mix of reasons really, and i'm talking sort of generally as it happens in other occasions.
usual stuff, like i'm in medication, on antibiotics, pregnant or trying, up early in the morning, on a diet, etc.
unless they are actually too ill to go, or just don't have the money - which is somewhat unlikely as they have known the occasion was coming up, though if it was in a far away place so involved hotels etc, so could be expensive, then i think its no excuse
i cannot drink at the hen night because i am on the atkins, but i am still going to go for a bit, just to show my face
i don't agree that someone without alcohol 'unsettles' other people at all - id say that was more likely just in the non-drinkers head - i doubt most people give a toss what others are drinking - i certainly don't.
i also wouldnt care if it bothered others as its up to the individual.