It celebrates the diversity of the people that are part of the league and have been through its history.
https://www.cfl.ca/dis/
This League has a longstanding tradition of welcoming players, people, from all types of backgrounds. Signed the first black QB. Signed the first openly gay player. Each team had a person they honoured. Esks had Joey Moss, Riders had a player of Metis decent, etc...
Think they did it last year too. Great thing they are doing IMO.
Go Riders!