You've been around long enough you should know this:

Server Maintenance Updates - Oct 20th
http://forum.naruto.oasgames.com/en/forum.php?mod=viewthread&tid=6981&fromuid=16848
(Source: Naruto Online Forum)

They post a maintenance update every week. That is when your server will go down to get the updates. The events will be after that. I know on my server, since the update happens at midnight, the events don't start until 5am server time (when all missions/dailies reset).