A hobby group that I am part of is holding a Christmas party. Tickets are £25. The invitation specifies that they are NOT doing this to make a profit, it's just meant to be a social occasion and the ticket cost is purely to cover the booze and food - apparently there is going to be lots of booze 
Normally I would happily pay the £25 and make sure I drank my money's worth but I am pregnant so obviously won't be drinking.
AIBU to ask for a discount?! Or will that make me look petty?
Obviously if it was for a charity or something I would pay regardless of whether I will be drinking or not, but that's not the case and the organiser has specified that the party is not about making money..... I'd be happy to pay say £10 but £25 seems a lot as I'll probably just drink a glass of orange juice and have a mince pie.
Also my friend I am going with is not a big drinker and will only probably have a glass of wine (2 max) and she won't be asking for a discount. Am I being cheeky?