At the end of 'Hearts', Robert Fripp applauded to Jon and Cris
Only Robert Fripp went to see Yes, but just beacuse King Crimson was going to play (and make they return to activity since 1984) in that theatre two weeks later, and he wanted to know about the acoustics of the hall... He was not interesed in the show. King Crimson was rehearsing two weeks in Buenos Aires prior to his debut.
To the question "Did you go to see Yes?", Bill Bruford replyed: "No, I know the current Yes very well... and it's not of my taste" There was also a rumor about a jam session with members of the two groups, but it was not true.
During the first show in the Broadway Theater, the Squire's bass didn't work during The Calling, and it was really a short show, but in the middle of it Robert Fripp, Bill Bruford & Tony Levin arrived and sat just in front of Jon, who smiled and saluted them. So, half of Crimson and Yes in the same place at the same moment. A curious thing.