Possible Clues:

• We never say energy's failed when it's party time
• When to don a 40-Down or prepare to throw 11-Down
• Party time: we yearn to get drunk with sporting hero
• After this, you'd be unlucky to lose your footing
• Last night?
• Hogmanay rave - Sweeney involved?
• Ease very possibly suggested by opportunity for party
• Last day on the calendar
• Occasion to shout out the ends of the answers to this puzzle's starred clues (from left to right)
• Traditional night for partying