There has been a lot of confusion on when the finale is scheduled for the event, so we've gotten a few quotes confirming that Act 4 is still scheduled for October 31st. However, there is a one-time event that is scheduled on the 28th at the beginning on Act 3.
- The pinnacle of the event (Act 3) was not rescheduled. We incorrectly listed the pinnacle as occurring on October 31 in the Game Update Notes. The date of Act 3 in the Game Update Notes has been corrected to October 28. The correct dates are displayed on the event page on the website.
- Act 4 will still occur on October 31.
On the holiday team, we are fully aware of the fact that not everyone can be logged into the game at specific time. We’re also aware that people live in different time zones, and those times can potentially fall on different calendar days. This is why each act is a phase, or a period of time, rather than a moment in time.
The one major exception is the beginning of Act 3, which is something that I think most people will want to be around to see. The choice of 12:00 PM Pacific Time/19:00 GMT on Sunday was a very informed, calculated decision. It was primarily based on the fact that it’s pretty much the peak of our weekly concurrency, which means it satisfies the highest possible percentage of our users. It also means that it’s the same calendar date whether you’re American or European.
For those of you wondering, having the event at separate times for separate zones is actually one of the worst options. Whatever happens is going to be on livestreams instantly and then on YouTube about five minutes later. At least this way, everyone has a chance to experience it in the game, without having it spoiled by the rapid availability of video on the Internet. [Source]