That's exactly what we did yesterday.
Despite the fact that I was exhausted after a grueling 24 hour shift at work and that I was sick and feverish with a cold/flu, despite the fact that the work schedule precluded having a "friend party," I was determined that Monkey was going to have an awesome 5th birthday.
We went swimming.
We listened to this, and danced around crazily and wildly in the kitchen.
We had "guests."
We ate Angry Birds pig cake.
We sang "Happy Birthday."
We had mounds of presents (okay, not really mounds, but apparently that's how it felt to the newly five year old.)
We had laughter, sugar, fun, and silliness. We had a birthday!