Over the last few years, I've rather made a habit of leaving jobs. Whenever I do, I try to keep in touch by joining or creating an alumni group. It's so easy to drift off into new jobs and forget until years later the friends you made along the way. Having an alumni group has also helped me get new jobs, which is pleasant.
This is a companion discussion topic for the original entry at https://jlericson.com/2024/01/05/popup_communities.html