Monsterdon is a weekly event on the fediverse, hosted by @Taweret@timeloop.cafe, where people watch a monster movie together by posting to the #monsterdon Hashtag.

More info

• https://wiki.neuromatch.social/Monsterdon

And this Sunday (Western Hemisphere, e.g. 8PM CT) (or Monday 1am UTC), the movie will be Forbidden Planet(1956)

• https://timeloop.cafe/@Taweret/114541252576223737

By coincidence, I only recently watched it for the first time

• https://lemmy.ca/post/43468504

Where to watch the film

• https://peertube.wtf/w/ehQReF6uWnXNmCLZwsEhV3 (where I watched it)
• https://archive.org/details/ForbiddenPlanet1956_201707
• https://youtu.be/HYjbn8f4PEY
• https://tubitv.com/search/forbidden%20planet (in some countries, not all)
• https://miru.miyaku.media/ (a linear stream synchronized for all viewers, go there near start time and find Forbidden Planet. It didn't work for me the last time I tried it, got an error like "Media in an unsupported format or server down", so have a backup plan.) More
• More possible sources, adjust for your location: https://www.justwatch.com/us/movie/forbidden-planet

I think you can go along with the live blogging via Lemmy if posts include the hashtag #monsterdon, but probably better to use Mastodon.