I tried this locally with bundle exec jekyll serve and when I click on the new event I get a 404 on http://0.0.0.0:4000/undefined

Sounds like a regression. Seems similar to issues #478 and #484

hmm, for the October course it's broken locally but works on the real site. I don't know what to make of that. I guess I'll just merge this, and let's hope it works on the real site

yeah, seems OK

oh, except you forgot the category: event at the top. I supplied it in d727431

No, did not forget. For each of the events I posted I copied a previous event posting. None of them have a category entry. Also, the README.md file makes no mention of such a thing.

... but thank you!

None of them have a category entry

Your October event does. Remember #484?

the README.md file makes no mention of such a thing

Perhaps you are not viewing a current version? I'm looking at https://github.com/scala/scala-lang/blob/master/training/README.md right now and it's quite explicit about it. If we're not looking at the same thing, can you be more explicit about where you're looking?

Seems that was added to the docs 18 days ago, when Andy fixed the bug that prevented my previous course listing from working

Sure. So it was in the README at the time you made this PR thanks to Andy's fix, no? Siding with Seth on this one.

In any case, the advertisement for your course is up, so all good on your side, right?

All good