Well, Anthony was asked and he said that Adam might have come across it on his own, so even he thought it might be possible that Adam could know about it.
Personally, I'd like to pretend that it's just a coincidence, because the thought of Adam knowing that *I* personally was at that concert, and did that just to f*ck with my head is tooooo weird.
Like a firework unexploded
Wanting life but never
knowing how