No one can force you to drink
Peer group pressure is for high school kids
Saying noi is not a slap in the face to your friends, No thanks but I'd love a sparkling water/juice/soft drink is a perfectly reasonable response. I don;t want to drink is also a perfectly reasonable response. You don't owe anyone explanations.
Try and focus on the reason you're there - your friends wedding - do the things you have to do to help.
Keep in mind other weddings or social events you've been to where things did not go well after you took the first drink.
Lastly - even tho you're involved in the organising - have an escape plan for if things get too hot.
I'd rather leave early than stay late getting drunk.
These links may be useful
https://www.soberrecovery.com/forums...val-guide.html (Social Occasion Survival Guide) https://www.soberrecovery.com/forums...-recovery.html (101 Helpful Hints For Recovery)
you can do this
D