@lukasros I had a blast, thanks. Mostly, I learned that I have a lot to learn. More specifically, I learned a tiny bit about namespaces, and about a tool called ngrok. And while I made some progress [jeremycherfas.net] towards my goal, I certainly did not get all the way.
The good news is that there is a virtual Homebrew Web Club [indieweb.org] this evening at 17:30-19:30 CEST and it is possible I will be able to make further progress. Maybe you could join in?
The only culture I managed was the Trials Museum, and I learned a lot there too.
All in all, a very good trip.