Short answers, pulled from the story.
The first documented football match in Canada took place on the 9th of November 1861 at University College of the University of Toronto. Sir William Mulock participated in that practice game before a club formed shortly afterward with unclear rules.
Albert Grey, 4th Earl Governor General of Canada donated the trophy to establish the Grey Cup in 1909. Initially an amateur competition the event eventually became dominated by professional teams during the 1940s and early 1950s.
The Canadian football field measures 110 yards long and 65 yards wide within which goal areas are 20 yards deep. Beginning in 2027 the playing field will shorten from 110 to 100 yards and end zones from 20 to 15 yards.
Once ten yards gained the offence receives another set of three downs rather than four as in American football. Downs do not accumulate if a team completes ten yards on their first play they lose the other two downs immediately.
Playoffs for the Grey Cup complete by late November in cities like Edmonton Winnipeg Calgary and Regina. The top league is the professional nine-team Canadian Football League playing its regular season beginning in June.