You could do an auction at your school...... either boys get auctioned off or girls do obviously for dates not for anything else
Or:
Quizzes
No work day, students choose what they want to do
Bad hair/tie day
It’s a Knockout competition
Treasure hunt
Longest chain of paper-clips, line of coins, etc
Carol singing..... goof time of year for that!!!!
Murder Mystery evening
Penalty shoot-out competition
Computer games knockout
Go on to google and see what you find!