Has anyone done this? I just finished reading Gary Penkala's CNP article on the Pentecost Vigil, which can be expanded to compliment the Easter Vigil. Apparently such a Mass has been celebrated in St. Peter's Square by the Pope for quite some time. Gary has an outline of how it was done there in 1993 by Pope John Paul II.
I wonder if it's still the same way under Pope Benedict XVI. :-)