I realized there weren't really a platform making a good job for users when you are looking up classes (art & craft, languages, dance, etc.). You always end up visiting different website and having a hard time to compare the offering. Therefore, we launched classalog.org. First in San Francisco.
The app is using Next.js (good SEO for each page was important to us) + firebase for authentification, database and some serverless functions. Next.js is hosted on Zeit.
I'm passionate about this project because as we spend more and more time behind our screens, we also long real connections and taking in-person class is a good way to meet people. It also helps people who want to freelancer and become an instructor to find more clients.
Feel free to give it a try, and let your instructor friends now they can get more free visibility. It's far from perfect but let me know what you think as we'd appreciate helpful feedback.