I don't remember seeing Altcoins advertised at sports events. A couple of exchanges collaborated with the teams to advertise their exchange, but I'm not sure if they advertised their tokens. Casinos mostly target popular leagues and teams to promote their platform, and Bc games, sports, and stakes are among them.
I have seen that Sportsbet also promotes Bitcoin when it finalizes its deal with the teams. I got a Southampton jersey with a Bitcoin logo on it. I also saw a boxing match in Amsterdam where Bitcoin was advertised. I don't know who the advertisement was behind, but it is crazy that people spend money to promote Bitcoin, which does not have an owner.