Advice for visiting parents tomorrow—bad relationship with stepdad that previously left off on a really bad note? (28F / 55M / 61F)

My stepdad (55M) and I (28F) have had a rocky relationship for past several years that really came to a head this past Christmas.

My mom (61F) and stepdad are both heavy drinkers and my stepdad is seemingly unable to get through an hour with me without saying harsh things to me (mostly once he starts drinking, which is any time I’m around them).

The last time I spoke to him was last Christmas time. We went to this party with some extended family and he told a story about the worst thing that’s ever happened to me in front of everyone, leaving me feeling deeply humiliated. I didn’t speak to him for the remainder of the trip and haven’t spoken to him since. I haven’t spoken to my mom much either, just a few phone calls.

I’m going to visit tomorrow, staying with my dad through the weekend and spending a night at my mom’s. I’m so anxious about spending the evening with them that I can’t sleep.

I’m hoping for some advice on how to approach this visit?