On game days, some stadiums can pack in 100,000 people or more – often dwarfing the populations of the towns that surround them. Sports writer Rafi Kohan talks with host Krys Boyd about the effect these venues have on the cities that build them – and about the communal experience that takes place inside them. His new book is called “The Arena: Inside the Tailgating, Ticket-Scalping, Mascot-Racing, Dubiously Funded, and Possibly Haunted Monuments of American Sport” (Liveright).