Billie Joe and Bill Schneiders guitar store, Broken Guitars, are hosting the 40th Street Block Party this Saturday (16th July). The event includes lots of live bands including One Less Zero (Tre's wifes band) and Jakob Danger (Billie's son) on the bill.
Being that Billie is attached to the store and their family members are playing, it's quite possible that Green Day could be one of the "special guests" for the day. Seeing how close we are to some kind of announcement, might be a good place