Possible Clues:

• Big day for 1 Across
• John Lennon's 'Happy ___ (War Is Over)'
• Noel got ten parents?
• Good time for ten 36 acrosses, perhaps
• For the present time there are ten parents here
• Might one get Samuel the Tenth up to it in December?
• After ten Samuel comes back to see 2 down
• Present occasion
• 10 degrees in the short December holiday...
• Santa time