N'anniversary 

If you have been separated/divorced longer than you were actually dating/married, then the day/date that you made the transition still belongs to the Universe.

Wow, I can't believe we are celebrating our 4th N'anniversary. I got married on the 4th of July to the "Love of My Life"; little did I know, 4 months later I would be leaving/ running for my life. Can I hit that, Tho?

N'anniversary by UnkahDell July 1, 2019

nonniversary 

What you call your wedding anniversary after you are divorced or separated.

Tomorrow I will be celebrating my 2nd nonniversary.

nonniversary by drguy June 1, 2013

nonniversary 

The day that would have been the anniversary of a relationship that failed.

Michelle: I would have been married to Oscar 12 years today... if he hadn't been a total cheating, lying douchebag that I divorced.
Amber: Happy nonniversary.

nonniversary by derby mined August 17, 2011

nannaversary 

A day that celebrates the birth of each of your Grandchildren and the day that you became their Grandparent. Celebrated each year in on the same day as their birthdays.

Nana, it's my Birthday, today. Yes, and it's my Nannaversary too, I became an Nana the day you were born, and I Love you very much.

nannaversary by margjoy August 1, 2015