shunniversary 

An annual event one chooses to ignore because of a grudge or ill will. A subtly hostileanniversary.

The unhappy couple chooses to observe their twentieth by way of a shunniversary, avoiding one another the entire day.

shunniversary by hrungnir May 29, 2016

SEAnniversary 

The anniversary of moving to Seattle.

I can’t believe it’s been 7 years since you moved to Seattle. Happy SEAnniversary!

SEAnniversary by kaaali August 1, 2023