Updated

An unusual convergence of sporting and entertainment events in San Francisco this weekend promises to bring up to a million extra people into the densely populated bayside city.

City officials are firing up their emergency operations center and canceling days off for police.

The weekend will include the opening games of the San Francisco Giants divisional playoffs, a San Francisco 49ers game, the annual Fleet Week celebration featuring the Blue Angels and the America's Cup World Series yachting races.

Add to that mix a highly popular bluegrass festival in Golden Gate Park and street festivals in North Beach and elsewhere and it has the makings for jam-packed streets and transit challenges.