Hi Dan,
I currently deal with multiple time zones on my calendar.
Vueminder has a feature to show a second time zone as a time bar on the left panel.
It is confusing to know the date of the second time zone.
It would be more convinient to add a second "Time Bar" on the Calendar. (See example in attached picture. )
There will be always two time bars moving on the calendar. One for local time (ex Vancouver), another for second time zone (Taipei).
Hope to see it happening.