On November 6th, 1983, Will Byers (Noah Schnapp) went missing in Hawkins, Indiana. To commemorate this occasion, fans of Stranger Things from all over the world come together to celebrate. Netflix also releases special content on Stranger Things Day. And it looks like that we might see a season 4 poster on November 6th.
The poster artist of Stranger Things, Kyle Lambert has hinted the same. While posting on 4 years of season 2, he wrote on Instagram,
"Stranger Things 2 was released 4 years ago today. I’m really proud of the art I created for this season. It was the first time I adapted my work across a full advertising campaign for print, billboards, social and merchandise etc. I learned a crazy amount and developed a lot of the techniques that I use today. See you on #strangerthingsday"
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Apart from the season 4 poster, Netflix might release a trailer and announce the release date. Watch this space to get more updates of Stranger Things season 4.