My husband and son found themselves on the Jumbotron at a recent hockey game. After that, the plan was to see if they could have a "camera-catching" sign when the Edmonton Oilers came to town. So this was the happy result! Go Flames! The presence of the letters "CBC" is to promote the broadcaster. They get a crowd shot AND some promotion. So fans put those letters in to make the signs more attractive. Edmonton has the sign "City of Champions" at the edge of town, so that's why the "City of Chump-ions" reference.
Cut out using a Cricut Expressions, with Sure Cuts A Lot software, which is now vintage due to the lawsuit. (If I ever get another vinyl cutter I'm going to make sure I get one where I can design and print my own designs.)