I went to the opening show in his hometown of Anderson, SC. Before the movie started, a short message from Boseman played. There were a lot of kids in the front rows and they were giggling when the message started up. At first I thought it was a gag open like Captain America's PSA gym video in Spider-Man: Homecoming.
But it wasn't. Boseman was speaking personally, not in character. He wanted the viewers to know how grateful he was to be a part of this film in particular, because it gave people who looked like him a kind of hero that he didn't have on the big screen growing up. In the days that followed, I asked people online if they had seen that message before the showing in other cities, and nobody had.
I later found out that
he'd bought tickets for over 300 children in Anderson to attend the opening weekend.