1. Get a Mastodon account, if you don't have one already.
2. Get the film ready (stream, DVD, download etc).
3. Get Mastodon ready (website, app etc) by going to the hashtag #KungFuSat
4. At the start time, press PLAY on the film, and read & write posts on Mastodon with the hashtag #KungFuSat .

There any many ways to do it, but personally I usually use:

• a laptop connected to my TV
• external or remote keyboard/trackpad
• a download of the film (.mp4/.mkv) on my computer, played in my local video player, on the left side of my computer screen/TV
• a web browser window with https://liveblog.stefanhayden.com/ (because you can enter the hashtag once & it stays for future posts; you don't have to keep writing the tag every time for each subsequent post) connected to my Mastodon account, on the right side of my computer screen/TV

Example re the #Monsterdon watch party.

• Left: SMPlayer playing video file of film.
• Right: narrow Zen Browser window with Liveblog
• • Upper area: Tags for posting window set to #Monsterdon & #MonsterMiru (a related tag), so that I don't have to keep typing them myself manually for every single post
• • Lower area: Search set to #Monsterdon so that I see posts for that watch party