I can appreciate that OP's frustration, because I experienced the same type of disappointment on our very first trip.
We were on our "once in a lifetime" trip, and as such, we planned SW/US/IOA and MK as our parks to visit. We were spending 2 days at MK, 1 full day and then
MVMCP later in the week. We specifically chose our first trip to MK to be on a Saturday, because it would be open until 11:00 pm., and we wanted to see everything. Unbeknownst to me, the Saturday we chose was the day they were filming the Christmas parade, and instead of running the Dreams parade at 3:00 pm as scheduled, they ran the Christmas parade late, at about 5 or so. This was my one and only (so I thought then) chance to see the Dreams parade, since we were only coming back to MK for MVMVP and would see the special parade then. Had I known that the parade would be changed, I might have picked a different date to attend. I was very, very, upset and disappointed. I never thought to complain to anybody (except my poor husband who had to listen to me b!tching) or ask for a refund. I got over it. We loved the Christmas parade, and enjoyed it again for MVMCP.
So, while I total get the frustration, I don't really get the drama.