Possible Clues:

• M&M hordes?
• 'Twist and Shout' succeeded for many
• So many of you on the beaches?
• Time, how it's measured mostly, and what it's made up of in great number
• "... with a cast of ___"
• Dan shouts out at many hundreds
• Numbers in the old days you would get on beach
• Lots of money taken from you, and aboard ship
• See 20D
• Large number in middle of summer