We have lots of open air here if that's what paul is into. Wrigley field, grant park, millinieum park, soldier field, even milwaukee's brewer studium has a retactable roof. But doesn't open detract from the sound quality. It would just give the grumpy people more reasons to post.
I can see it now,posts like..... "Not only did he do hey jude at the concert, you couldn't hear the sound right. Why would he do this song outside with out the proper acoustics?"
He can bring his ukulele to my garage and still sound good to me.