Possible Clues:

• Revelations
• Epiphanies
• Startling revelations
• Surprise, surprise!
• Wake-up calls
• Startling revelations, or what the answers to the starred clues have, phonetically
• Unexpectedly enlightening experiences
• Enlightening experiences ... or what 18-, 26-, 41- and 54-Across have, phonetically speaking
• Unexpected revelations
• Epiphanies, and what the starts of 17- and 37-Across and 11- and 28-Down may be