That is a subtle feature in the post editor, Kristina, second icon from the right. You can enter a data/time in any reference time zone (here’s some older notes with details).
There is also an ability when viewing to save a calender .ics file that could be used in any calendar.
But thanks, I did not know in email that it gives UTC time! It seems both approaches are useful (always include a time zone converter link).
There’s always juggling with international events, but I want to do everything to avoid making people to do their own timezone math.