Someone seeing you bald then later with hair isn’t that big of an issue actually, people don’t remember someone’s level of hairloss. I should know because I flaunted my bald head for years and now when those same people see me, most see it as normal as if I was always like this, some look in surprise for a moment then act normal thinking this is how I always was. If someone is really inquisitive, you can just shrug it off as you had a bad hair day in the past or just tell the truth. They would be surprised and don’t believe it thinking you’re joking 😂 People’s perception of HTs is still of those old hair plugs and pluggy ones. < Yes all of this has happened to me.
Someone seeing you bald is a different story though and the reaction is not good or negative. If it’s not your wedding, you can just consider this a bad painful day you have to go through. The same people who see you bald will act like you always had hair when you show up with hair few months later.
I should mention ^all of this doesn’t apply if you’re slick bald NW7, that’s a hard memory to mess up or forget. But if you show up as anything below NW7 with some level of surviving hairs (ie not slick bald) when you show with full head of hair, people just think you always were like this and now have better hair days.