Board Thread:News and Announcements in game/@comment-32803230-20180326140454/@comment-32271305-20180424170356

The announcement has the same date for both, 4/26/2018 01:00 am PDT.

Perhaps you were referring to this (Google Translate translation):

''● Preparation period 4/25/2018 (Wed) 0:00 Regarding the event, we will hold it again as soon as we are ready to add the stage.''