I didn’t reconcile so I do celebrate e every single occurrence except anniversaries.
I do poke fun "celebrations " for the dates of her betrayals, those are the anniversary ones if you want to stretch it. But the kind of gift for those is a night out for me with closing my phone or a condom for her with a card "don’t bring stds home", tops.
However the simple reason is this: celebrate what is meaningful for You.
If you feel your wayward changed and made up for his sexual and emotional abuse of You, and you are still thankful that you met and married this person, by all means celebrate.
If he means something positive for you, if you rebuilt a new relationship and are happy no matter the wounds, by all means.
That calls for a celebration.
Follow your feelings, that’s always the best compass.