Parents of toddlers, how strict are you with nap-time?

58F, parent to a grown lady. I am hosting Christmas and sent the text to family regarding when to be here and the details.. One young family with a 3yr old and newborn will be 1.5 hours late because I said 1 pm and that is during the toddlers nap time. We are a small family so it’s not like the house would be full and they would barely be missed . This happens with every get together, we try and plan around one nap. I have to work the day after Christmas and didn’t want it to go real late. I know I’ll be exhausted. We will do dinner and gifts. I’m trying to be understanding of this with new parents. When my daughter was young, I adjusted her naps all the time. I was a single mom and we were on the go. And may I say she turned out perfect. 🤩 I know things have changed. Are you a stickler for nap times? Would you ever change it for a special holiday being with family? How old are you children? I’m trying to figure out if I’m just old and out of touch. Please advise.