Yesterday was another big celebration day here: Found Day. That is the day we brought home our good dog Max, two years ago now.
Mostly only my girl really remembers it. But she is a good one for that sort of thing. If she could have had a party with lots of doggie friends and piles of BilJacks (liver treats for dogs!) she'd have done so. Actually, she'd make it a tea party.
The term Found Day came from one of the best books I have ever read: The Star of Kazan by Eva Ibbotson. In the book the found one is not a dog, but a child. But it works for the dog too.