Board Thread:Questions and Answers/@comment-64.233.173.223-20150425034435/@comment-24956068-20150425190252

Yes, you should wait. Based on my observation, this event often appears shortly after new treasure releases.

I also believe in a myth that the hour you summon will decide which treasures you will own. So if you're getting one or two "bad" items, just stop and try for a different time.