Step Dad/bio Dad Dances

Hello!
So, I am struggling with a big issue about special dances. I have a dad and a step dad. I grew up in my dads house, but he didnt really raise me, I took care of myself and my two sisters without his help. We are also not very close, I moved out of his house 8 years ago, and I have only seen him twice since and we never talk. My step dad is a great man, but I also didn't grow up with him and have only known him for 8 years. PLUS he is the man my mom left my dad for. So its a big dilemma for me to think about special dances and I just need help figuring out what to do. I thought about not having dances at all, but my Fiancés mom would be devastated and I would never take that moment from her. My Fiancé doesn't like either of them so he doesn't have much of a helpful opinion. But I just don't want to be disrespectful or cause any fights or problems. Help please lol.