So when did it start when could people see the movie days before its premiere date. I mean like stuff like justice league or black panther where you could watch it and get like a poster.

I don’t know when it actually existed. Maybe during the 1980’s or something. Maybe they could have like one of the actors show up and sign something. I know that it depends on the decade too and it had to be when they had sound in movies. How many movies actually got that treatment? I know that the people who made the movie like the actors and certain writers could see the movie and it would be posted everywhere.