6 years old
How many words can you make from one word?
Pens or pencils
A list of Harry Potter words (names, places, potions, etc.)
Pass out paper and pens/pencils. Pick a word from your LIST and tell everyone what it is so they can write it at the top of their sheet.
Give them 5 mins to think of as many words as they can from the one you gave them. Who ever has the most is the winner.
You can do this several times. You can also split people up into age groups if you have a large group so that the kids feel like they have a chance instead of going up against older teens and adults.