Events only displayed in the primary language they've been created in
It appears that if an event is created as a single language event and other languages are added later, the event will not appear in the listings for the other languages. Also, the event will only appear in My Events if you are logged in in the language in which the event was originally created.
Example: Event "Database Synergy Day 2025": created in english only while logged in in english. Later the other languages were added. It is listed in EN but not in DE - detail pages are available in EN and DE. The event is accessible in 'My entries' when logged in in EN but not when logged in in DE.