On a serious note, I have read of some people doing "divorce ceremonies." You don't do it together with your divorcing spouse, but it is kind of a celebration for you and your friends and your family. You gather together, maybe have a ceremony and bid good-bye to the old, then celebrate the start of your new life. Sometimes there is part of the ceremony where you smash your wedding/engagement ring with a hammer. And I read about this one company who will then take your smashed jewelry and create a unique piece of jewelry out of that, as a memento of the end of your old life and a symbol of the new.
I don't think I'll be doing that when our divorce is final as my husband never gave me an engagement ring (he didn't realize there was an engagement ring and a separate wedding ring). And I took my wedding ring off several years ago due to a weight gain and I seem to have misplaced it. It's probably somewhere around, but I am not inspired to go look for it.
As far as celebrations go, my two sisters and I do have some plans. One sister has a great bottle of champagne from Dundee, and we are going to get together and down it all, plus other stuff too. My sisters have both been very supportive.