How did a hockey player cause a riot? How did this riot change things forever?

Following the evacuation, Campbell took refuge in the Forum clinic, where he met with Canadiens general manager Frank Selke. The two wrote a note to Adams declaring the Red Wings the winner of the game due to the Forum's ordered closure. The departing crowd joined the demonstrators, and a riot ensued outside the Forum.

This changed things forever because  He played only 28 regular season games that season, scoring 34 points, as he missed three months due to a severed Achilles tendon. (He damaged his Achilles’ tendon, and it affected him to not being able to play) .

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Explanation:

a change of venue is the legal term for moving a trial to a new location. a change of venue request because venue is improper means that the removing defendant believes that the case may not be in that venue because it is improper under procedural rules.