Does anyone know this book about a cat?

When I was younger there was a book that i would read. I do not know what happened to the book or the name. All i remember is that it was about a cat the when the owners would leave it would have parties. I believe they used to take place on wednesday but I could be wrong. I really hope someone can help. I have been trying to find the book for my son and I have no idea what it is call.