Derby concert ticket, front-row, blue lanyard, lost

I lost my concert ticket for Sonic Skyline at the Victoria Hall in Derby yesterday around 3pm. It's a standard A6-size ticket with a white background and a blue holographic stripe along the right edge, plus a black barcode on the back that's a little rubbed. It came in a clear plastic sleeve attached to a blue lanyard, and there's a tiny crease on the top-left corner. The event is sentimental to me—it was a gift from a friend—so I really need it back. If anyone finds it, please check near Market Place, intu Derby, or along St Peter's Street by the Derby Cathedral.