If Paul McCartney is in the New York City area this weekend it would be great if he was a surprise guest at Eric Clapton's Crossroads Guitar Festival at Madison Square Gardens on either Friday April 12th or Saturday April 13th.
I would be most thrilled with that as I'll be attending the show tomorrow night!! If it happens though (please!), I sincerely doubt it'd be any of the standards you mention as the crowd would riot: WMGGW, however, would be a *whole lot* of awesome. From your keyboard to Macca's brain, Timmy!
I have no idea where Macca is this weekend, why should I? I'm just saying it's a nice hope. I do agree with you if Macca did guest with Eric Clapton at Crossroads Guitar Festival 2013 they should play "While My Guitar Gently Weeps." It's by far the most fitting song that they could play together. Hell, even if McCartney doesn't guest with Clapton, he should play it.