Dear Max,
The term ‘fashionably late’ is just a term that someone who is always late came up with to sound cool. Being ‘fashionably late’ is just being late. Arriving on time doesn’t help you much either. It means you made it, but just barely.
Get where you going early. It gives you a few minutes to prepare, get acclimated or chat before whatever you’re doing gets started. You’ll be glad you did.
Love,
Dad