I'm not talking about Mom and Dad showing up late. The parents to watch are those who are driving the kids. If the dad with the face tattoo and the unrelated mom with her leather pants get to venue with their respective kids while you wait for your own spouse to show up with your kid, that means you're late. Your kid was told to be there by 5:40, and the 6pm start time was meant for parents traveling separately. Or grandparents, who were all there by 5:15, anyhow. Luckily for my family, we only have a few school-related events left before we get to show up 45 minutes early as grandparents.