Jay-Z and Mayor Nutter Making a Major Announcement Monday Morning.

We don’t know what exactly will be announced on Monday but the mayor’s office is asking the media to attend a press conference at 10:30 am. Their only clue about the subject matter is this line: “Mayor Nutter and Shawn ‘JAY-Z’ Carter to make major announcement.”

We’re hearing it’s a massive, multi-day festival over Labor Day weekend.

Jay-Z posted the video above as a teaser.

No clues about the location of the presumed festival. But Jay-Z has performed at the Art Museum steps before, when he participated in the Live 8 concert. Check out the video of his performance then: