Possible Clues:

• Celebratory shout heard before "Auld Lang Syne" is played, and an apt title for this puzzle?
• Message spelled out by the 12 added letters in this puzzle
• Greeting today's settlement of any pay where parking must be included
• Words to be shouted at midnight
• 1/1 wish
• Cry after a countdown
• 1987 Peter Falk crime caper
• Countdown concluder
• Seasonal greeting