After a Christmas season and a Halloween season, the marketing for Stranger Things chapter 3 has gone all-in on an 80s summer vibe, harkening back to a time when the weather was warm, the shorts were extremely high-waisted, and sweet dreams were, in fact, made of this. If the July 4 premiere date didn't tip you off, 13 firework-filled new character posters introduce the idea that Independence Day will play a large part in season 3's storyline, with a tagline promising "one summer can change everything." I know the throwback-bordering-on-copying vibe Stranger …