It happens every event they release (at least in the last 2 months), they always need to make hot fixes because something is not working in the event.
Well, at least some of the team that undoubtedly worked the weekend on this are not the people who wrote the code or were responsible for testing it. These kinds of things tend to be an "all hands on deck" sort of situation, and many of those hands aren't responsible.
Don't get me wrong, I'd like my game to work, but I still feel bad for their work/life balance when it doesn't.