When in doubt, pray.
November 3 2012
Obama for America Ohio tweets, gets dozens of people to see Stevie Wonder perform http://t.co/nEvKFxEa via @techiblog
November 04, 2012
/http%3A%2F%2Fcdn.techi.com%2Fwp-content%2Fuploads%2F2012%2F11%2FStevie-Wonder.jpg)
Obama for America Ohio tweets, gets dozens of people to see Stevie Wonder perform
There are two types of successful unscheduled or late-announced events. You can blast it out there and generate viral buzz online and offline and hope that enough people change plans and come to the event impromptu, or you can have the event "happen" in the middle of an already-large gathering.