I celebrated in many ways, large and small. I went for lunch with a trusted friend, then made a (small) purchase of a collectors item I had been delaying for years. My friend pointed out that it was less than 0.01% of my net worth, so why delay any further.
My real celebration was a couple of months later, when I told my boss I would no longer be working there. I took a celebratory drive to the beach, had a lovely glass of champagne, and smiled all day. That was the best!