'Frozen' and 'Harry Potter': Behemoths on the Way to Broadway
One is already a dramatic blockbuster in London; the other is a musical blockbuster in the making. There are no sure bets in the theater, but the stage adaptations of "Harry Potter" and "Frozen" are two that you can take to the bank. Uh, make that Fort Knox.Shows that live up to expectations are rare. But "Harry Potter and the Cursed Child" opened last month in the West End to rave reviews and overwhelming box-office…