Lots of leeway in keeping areas (and especially roadways) clear for emergency vehicles/emergency operations.
But let me see if I'm understanding this correctly - somewhere near Camden Yards there were assembled crowds of unhappy people expressing their displeasure. (TV Snooze showed pictures of several folks smashing windshields of several cars. Was not really watching but presume there might have been other expressions of displeasure happening.)
"Don't go stupid places with stupid people to do stupid things [that will win you stupid prizes]."
And you are looking for folks who would insist in exiting Camden Yards into that environment? Why? (Discretion, valor, all that stuff.)