I agree. This was badly thought through. I read elsewhere that if the last skelly ship (with the named captain) is sunk after the in-game calendar clicks over to the next 10 days (and the next region becomes "live"), then credit is not given for defeating it. That needs to be fixed!
Given that we three weeks for this event, short of changing the schedule entirely, the least that Rare should do is switch it around for the second and third weeks. Thus, for example, if in week 1, The Ancient Isles is active at 8:00pm your local time (and it must be somewhere in the world), then in week 2 you can expect The Wilds to be active at 8:00pm; and in week 3, The Shores of Plenty will be active at that time.