Great idea for a birthday! Everyone at the party writes about a funny story, experience they shared or advice about getting older. Give it as a gift at the end of the night. It's a keepsake and it's inexpensive but meaningful gift.
Make an outdoor music wall. Ages Respond positively to transitions from desired to less desired activity when paired with music. Moderate movements to tempo (fast/ slow) and dynamics (loud/soft) of music heard.
Make a pattern, repeat it, using elements. The black felt or paper background makes the patterns "POP" and intensifies the pattern. Reggio inspired approach to math- provocation at Mathematics and Science in School District (Richmond) ≈≈