If this would be implemented it would be unfair to specific regions since players in Australia and Asia wouldn't be able to participate in any events at all. How else will they be able to get EC? We have a large player base from those areas we can't discriminate two entire regions because of how far they are from the server it's something they can't help.
To remedy this, we could have Asia PRs hosting events for players with an Asian IP, European PRs hosting for players with an European IP and so on.
Scheduling Events for each region to be at the same time in their timezone (Asian Events would always be at 10:00 CST, 14:00 CST and 18:00 CST for Asian timezones, while European Events would always be at 10:00 CEST, 14:00 CEST and 18:00 CEST)