Fill an inflatable pool with plastic balls, Bubbles!
pin a party hat party game
First Birthday Party Activities, like the band with objects idea for small guests!
ANOTHER GAME TO PLAY WITH THE HERD- Ball Toss. Would also make a great "rainy day" activity. You could even find tubs or buckets of varying sizes (like nesting bins) for more of a challenge for the older kids (Think Skee-ball).
First-Birthday Time Capsule---LOVE it! Might have to make on for Ethan a Birthday Time Capsule.