It sounds clear you should NOT attend this event. You don't drink, so going to wineries makes no sense. We had something similar for a holiday work party, and I simply told them I wasn't attending. I understand the sentiments of feeling things aren't fair. I was an avid brewer of beer and it was a huge part of my life. It was a really fun hobby, and a part of me would love to still be involved. However, that was another chapter in my life. Your 5 months of sobriety is great! I certainly wouldn't throw that track record away.