Heres my tip to spotting him, just during the break, like when fiona is on (give him like atleast 15 mins to settle down first) then take a walk around im sure you'll run into him. If not him, you'll see shane becuase he's a lot less noticeable. When i saw him he was just watching the show and smoking a cig.
Anyway i didnt get to see Viv
Oh by the way, Fiona is a crazy woman! She said during the concert "it is weird playing during the day, last time i did that i cried through half of the show". Through some of the songs she would go and hide behind the piano heh.