I was trying to check the cancel policy for you but I keep getting stitch errors.
I have tried a lot of the different dessert parties around WDW.
Usually I am travelling alone and like to check them out to compare.
We did the Illuminations dessert party for the 1st time on DS's 21st birthday this past July, after he spent the day drinking around the world.
We enjoyed it. The desserts were ok and savory items were good, and DS drank enough for both of us.

Although I did have champagne and some rum punch too.
These dessert party's are overpriced in my opinion, but I like to check them out anyway.
I have done Wishes DP, Illuminations DP, Star Wars DP in HS, Osbourne Lights Dessert party at HS, and the Jingle Bam Dessert party in Dec. at HS.
I'm planning to check out Tiana's ice Cream social on MY birthday in March. That one is really overpriced.
My favorite has always been the Wishes party. They had the best desserts, in my opinion.
If I had a big family I wouldn't be doing these dessert parties tho because it is expensive if you don't have alot of money.
If you are worried about viewing location. there is plenty of great viewing areas around the entire lagoon.