Possible Clues:

• 'Wayne's World' catchphrase
• Repeated 'Wayne's World' cry ... or a hint to each half of 17-, 26-, 51- and 63-Across
• Continue with the fun, and a hint to each part of the answers to starred clues
• 'Keep the fun going!'
• Keep celebrating
• Comment from Wayne or Garth
• "Wayne's World" encouragement