Possible Clues:

• When Romeo and Juliet have their balcony scene
• Middle of many plays
• When Juliet asks 'Wherefore art thou Romeo?'
• Last part of ''Cats''
• It may follow the first intermission
• When Macbeth asks 'Is this a dagger which I see before me?'
• The second half of 'The Book of Mormon'
• Play continuation
• It follows the first curtain
• When the Sugar Plum Fairy appears in "The Nutcracker"