Sask. Roughriders hold their annual fan day at Mosaic Stadium sask-roughriders-hold-their-annual-fan-day-at-mosaic-stadium #Sask #Roughriders #hold #annual #fan #day #Mosaic #Stadium, Throwing around a football with fans, signing autographs and taking photos, the Roughrider’s fan day was a dream come true for any Riders fan.