New realities require new types of security planning
Hudson Bay Department Store, Vancouver, post-riot. Newsphoto.
With the post-hockey game riot in Vancouver, after the Vancouver Canucks hockey team lost to the Boston Bruins in the Stanley Cup finals, I think that every major city, including college towns where college sports are big, should have to do contingency planning for post-game riot avoidance management.
See "Vancouver Burns After Canucks Lose Stanley Cup" from The Atlantic and the reference list on spectator violence in stadiums from the Center for Problem-Oriented Policing.
Just as the Federal Highway Administration has a program with (as usual) an extensive set of excellent resources for Managing Travel for Planned Special Events.