Yes, I am able to choose whether I like to go to a family gathering with her folks or not. It's not even that her family is crazy or something. It's mostly fine, but sometimes I just don't want to spend time with people who are boring just for the sake of sitting together for few hours. And she supports my choice to not go, because that's what loving partner do.

We do things we both like together. We do things only one of us want separately. Frankly, talking about marriage in terms of "sacrifices to keep he peace" is something I'll never do. What's the point of being married to somebody if you then live like that? What kind of partner would deliberately put their significant one through a miserable experience?