anniversary (n)

My parents went out to eat for their wedding anniversary.
Today is our 10th wedding anniversary, and we're celebrating with a romantic dinner to commemorate a decade of love and partnership.
The company is hosting a grand event to mark its 50th anniversary, recognizing half a century of successful business operations.
Every year, we gather with family and friends to celebrate our parents' anniversary, honoring their enduring love and commitment to each other.