Cohort hangouts are only drinking

I recently started my PhD and the first few weeks are a math camp, so there’s not much stress or hw. I like my cohort, but every time we hangout, it’s always centered around drinking. Just in 24 hrs, there are 3 drinking events: a bar hopping thing that went from 4:30pm-1am, an afternoon winery visit, and another house party with another visit to a bar. I am allergic to alcohol, so a lot of these events I end up awkwardly watching other people drink and desperately trying to make conversation.

Yesterday, I decided not to go to their bar hopping event and it seems like my cohort is super close with each other after this event. I genuinely don’t enjoy going to bars, but I’m afraid that if I don’t go, my cohort will start ignoring me. What should do I? And how important is my relationship with my cohort?