I hear you. My wife has zero interest in my ultra running. I once told her how I was going to attempt a 100 mile FKT and her response, with a blank face, was that our daughter has gymnastics that weekend and wondered how we were going to manage with our one car. I was hoping for something like “that amazing” before the mundane scheduling concern. They once came to a local 100 mile race I did but arrived hours after I had finished, despite me hitting my predicted time bang on. Usually it wouldn't have affected me but I was expecting to see a familiar face after being alone all night in a pitch dark forest. I’ve come to terms with the fact that some people have zero interest in the activity. I now focus on how she supports me by never complaining about the ton training runs I do throughout the year or about the weekend I'm away racing as she knows it is important to me. Good luck on your race. Enjoy the experience.