What are the meetups usually like, content-wise? Another user commented that they seem more like mixers -- is there any scheduled content at all?

We have announcements in the middle for around 15 minutes where anyone can stand up and say something to everyone.

Aside from that, it’s a pretty free flowing, friendly mixer event.

I went to this event a year or two ago, I happened to be passing through japan. It's a very friendly event, real mix of different tech / startup presentations. Would highly recommend it if you're in the area :)

Curious, because HN discussions are mainly in English: are conversations mostly in English or Japanese?

How's the ratio of locals to foreigners?

Almost all participants are English speakers. Typically 70 or so of the participants are non-Japanese.

I've updated your links. Thanks!