Show that you only saw certain songs
I think a checkbox by songs after you've clicked attended could be a good idea. For example, when I only see a band play half a set at a festival I don't add it to my profile as I didn't see all the songs. this could be a good way around that - we could untick songs we missed.
Lasse David Sand Østergaard commented
I only see this becoming relevant if they add a statistic for which songs you've seen live how many times - which I suggested, though. If they do, yes, this would be a great addition!