Looking at the history...Wishes seems to start at 8 pm in the early part of November...mvmcp starts around the second week of November...so the fireworks would change...the entire week of Thanksgiving Wishes happens at around 10pm
We were married November 10, 2008 (a Monday). We were going to do a Wishes cruise the night before the wedding with 10 guests. We booked the boat 90 days before. I kept checking the time of Wishes and it was 9:00pm. The Saturday before, they changed the time of Wishes to 10:00pm. It turned out to be a busy weekend (although our guests said the parks were empty). I believe it was Veternans Day Weekend and might have been the start of NJ week. We were able to cancel our Wishes cruise as our ceremony was 9:00am in Epcot and no one wanted to stay out that late the night before.
Just wanted to let you know that they do change the times depending on the crowds.
Also, November 11, 2008 was the first night of MVMCP that year. We went with our bridal party (and ate dinner in the castle before the party) and had a great time with everyone.