Two approaches really - be honest with people and then you'll find out where your mates are. With my friendship groups, I have one lot who don't always invite me out to beer festivals thinking I won't enjoy it, the other lot have realised that they have a driver in the group so make sure they...
For those who are abstaining, this thread has been running for a while - https://www.northstandchat.com/threads/alcoholic-like-a-beer-or-two-too-much.374011/