“Something is due to happen here. → http://miku-39.jp“.
The website shows a calendar with the dates August 1st and August 8th circled to indicate some sort of events. There is also a line under the last week of August leading up to Miku’s Birthday, which might indicate something will also be happening for that entire week. Not much else is known besides what we see on the teaser page, so share it with your friends and watch closely to see what happens!