Ask HN: Class/Workshop Recommendations?

I'm looking for recommendations for computer flavored classes and workshops. I'm not interested in "bootcamps" or MOOCs or your favorite YouTube channel. I am interested in in-person (or synchronous online) classes and workshops taught by one or more knowledgeable people about something they are passionate about!

Classes I've taken in the past and would recommend: https://arsiliath.gumroad.com/l/december-2022-compute https://www.heavypoly.com/blender-online-class

Please share any classes you've taken that you've enjoyed!