Blue concert ticket stub found in Aberdeen

I found a blue concert ticket this afternoon around 2:15pm near The Lemon Tree on Schoolhill, Aberdeen. The card is a standard A6 ticket with a perforated edge and bold white text for the event name. The back side has a handwritten seat number 'D17' and a small coffee stain at the bottom corner, plus a tiny red sticker with the initials 'A.J.' that could help the owner recognize it. It's for a gig at The Lemon Tree this Friday, and I figured someone might be really worried about misplacing it. If it's yours, drop a note here and I’ll hand it over as soon as possible.