There has been an announcement recently about kaigi being delayed.
https://esa-pages.io/p/sharing/68/posts/1006/b15a58c675f5a69d06e5.html
In particular:
"All the events that were planned for April 9th-11th will be rescheduled
to September"
The dates listed here should perhaps be changed too, but I think a more
important question may be whether this may affect the ruby 3.0 release
process? I am asking specifically because from September to December
there is not as much time, compared to e. g. April to December.