Spotted this in today's Dear Abby:

DEAR ABBY: My father, who is happily married to his third wife, recently came across some photos of his first wedding to my mother in 1961. Apparently, the walk down memory lane didn't stop there for him. He asked his wife, who evidently agreed, if he could have a party to celebrate the 50th anniversary of this event.
I am appalled and kind of nauseated by the thought. Do you think I'm overreacting? I have considered refusing the invitation. Should I just suck it up, or tell my father I think the idea is narcissistic, insensitive and foolish? -- SICK TO MY STOMACH
DEAR SICK TO MY STOMACH: Your question is a first. Why your father would consider throwing a golden anniversary party to celebrate a marriage that turned to lead and "sank" is mystifying. Equally so is his current wife's willingness to go along with it.
While you and I might consider his idea to be ill-conceived, resist the urge to indulge in name-calling. Let him hear from others that the idea is narcissistic, insensitive and foolish. And, by the way, you are not obligated to accept every invitation you receive.