Going back, I have a clear memory of big events with global viewership being typically advertised with multiple time zones at a time. It was almost a bit of a marketing gag even for financial firms to have a ton of clocks up with labels displaying many different time zones.

So yes, no reason to chose 1 time zone and force readers to do mental math. Just list “London: , Tokyo: , Sydney: , LA: , NYC: , Lagos: , Singapore: , Mumbai: “ etc.