Possible Clues:

• There are so many of them, and so entertaining
• They're so entertaining and so many of them
• Masses
• Party planners
• Leno and Letterman, e.g
• Brittany Luse and Eric Eddings, for 'For Colored Nerds'
• Serves and receives, say
• Entertains multitudes
• RSVP recipients
• Scottie Beam and Sylvia Obell, for 'Okay, Now Listen'