I don't think there is a term...
You may be looking for the term 'Golden' if thinking of 50 years of marriage, other than that, answer as above
A 50-year celebration is called a "semicentennial" or "quincentenary." It marks the halfway point to a centennial, which is a 100-year celebration. The term "golden anniversary" is also commonly used to refer to a 50-year milestone, especially in the context of marriages or significant events.
An 150 year celebration is called a Sesquicentennial celebration
It is called a "centennial celebration"
A 100 year celebration is called a centennial celebration.
60 year celebration
An 150 year celebration is called a Sesquicentennial celebration
55th wedding celebration is Emerald.
Centennial
It is called Centenary.
Diamond Jubilee
An Emerald anniversary
Diamond Jubilee