Same thing happened to us.
I was VERY fortunate to have been able to plan a trip around one of Disney's room/park deals. Never stayed on property before, but ALWAYS wanted to. In the past, in order to afford our trips, it's been whatever hotel was cheapest. Even better, the trip coincided with my parents 35th anniversary. So, I scrimped and saved every dime I could in order to afford to treat them to a Disney trip for their anniversary. We stayed at POFQ during one of those hurricanes last year. (BTW, Disney properties are EXTREMELY well constructed! - With the blinds closed, you wouldn't have even known it was raining!) Anyhow, part of the deal was that you got a lanyard with 2 "starter" trading pins. I wouldn't have ever expected it, but my father sort of got into the pin thing because of that, wearing his lanyard, and purchasing several pins to remind him of the trip.
They've talked about formally "renewing their vows" for years, but never really got around to planning it. I looked into doing it at Disney for them. Well, I'm sure it's a good deal, but WAY out of my price range. So, I had heard about the "rehitching ceremony" on the DIS, and I figured this would be a great surprise for them, even though it's not "formal", it really would've been a teriffic memory.
Called a few weeks in advance to make PS arrangements and made sure to ask for the rehitching ceremony. No problem.
When we get down there, I bought 2 "Anniversary" pins to present to my parents, for their brand new collection.
Show up for lunch, remind the CM about the rehitching ceremony. No problem.
We're eating lunch. I'm practically jumping out of my skin, because I really wanted to surprise them. Waiting. Waiting. Check comes. Hmmm.
I get up to "go to the restroom" (really find the waiter and find out about the ceremony). He tells me they cancelled it 2 DAYS AGO! No notice. Nothing. Neither the PS person told me it was cancelled, nor did the host.
You could not believe how disappointed I was. Chances are that I'll not be able to afford to do something like this for them again, especially timed to a "special" anniversary.
So, I'm sorry to say, it doesn't look like you'll be able to do the "rehitching" ceremony.