First off, it’s totally normal to be nervous about doing these things sober for the first time. I know I was!
I went to my first sober social when I was a couple months sober and I found these resources really helpful >>
I also felt like I really wanted to go, so for me having an exit plan was important. I was worried about leaving early but on the day it really didn’t matter. I noticed lots of people do it and no one bats an eye!
I had something to do early in the morning the next day which gave me something to look forward to as well as a reason for leaving early in case anyone asked (although no one did, ha). I also had a sober buddy and made sure I always had a drink in my hand - it was a house party so I bought my own but that included sparkling water and ginger ale.
For me it was really helpful to realise that while my presence at functions is usually appreciated, it is very rarely so crucial to the success of the event that I have to stay if I’m feeling uncomfortable. Like @Girlinterrupted I was also surprised at how much most people actually don’t go mental. It was brilliant to really be present, to enjoy the company of people I like, not over share, not say and do things I later regretted, to dance and chat and laugh and remember it all the next day, hangover free!
Have you read This Naked Mind? I would recommend it if not. There is also loads of other quit lit, recovery podcasts etc which might be worth dipping into to, to help strengthen your recovery mindset before you go. Lots of examples here! >> Resources for our recovery