The lesson
In a merch sales deck, let finished product shots of artists' real tours serve as the pitch, one line per slide.
The cover splits blue to red over a crowd photo with a distressed "SECOND CITY PRINTS" logo, three small icons and a contact email in the corner. Inside, a one-sentence positioning on red leads into a wall of artist clients, then one tour or web merch line per slide shot flat, with red divider photos for each service.
Don't show artists or tour merch you didn't produce, and don't copy the red and blue colorway. Keep the client wall followed by one finished product per slide.