Possible Clues:

• Disappointing occasion
• Happening that's no big whoop
• Anticlimax of odd concert finale?
• It's no big whoop
• Anticlimactic happening
• Trifling occurrence
• It's anticlimactic as nobody lets off steam
• Presumably odd time in trivial function
• Love opening fixture with teams depleted?
• Nobody let out it's a damp squib