I thought those rights were intended for recording purposes at mini corps. That was the impression I was under when I was in charge of getting them for Sky in '07. The way I always understood the laws is that you have to have the rights to perform the song for a paid performance (I.e. admission charged to the event) or if it is going to be recorded and sold. We were able to use the Sky Signature in 2005 for on field warmup without getting rights to it because it was not part of the performance that the fans paid for. Technicality I know. Since I and E is free to attend and there will be no recording, why would it be necessary? (Based on what I thought the laws were or what they actually were 7 years ago anyway.)
A small side note: If you play a solo, duet. whatever and are using stock sheet music like out of a Hal Leonard book, that is their publication and it is perfectly fine to perform without additional rights. That's what all of that copyright stuff is for at the bottom of the page.