I went to one as a teenager when I lived in Haiti. It was one of our neighbors who was a Manbo and was hosting a ceremony. shyt was wild and beautiful at the same time.
I couldnt stay til the end because while i was there i saw my dad's truck drive by and he would have killed me if he knew i went.
People despise it for many reasons. Some of it is Christianity. Some of it is ignorance. Some of it it evil shyt some vodouyizans do and people blame the entire religion. I know that's the case for my dad. I know there were stories of some young girls dying in the 1920s and 1940s and people blaming vodouyizans for killing them as a sacrifices or to make them into zombies or whatever. It turns out it wasn't true but you know how people are. They had already drank the Kool-aid and there was no stopping that train.
Many of the most famous female haitian artists from back in the days were vodouyizans and proud of it and all their music reflect it. People like Lumane Casimir ans Carole Demesmin. Tho it's advertised as folklore. Carole is like 80 y/o now but I still love her music
Carole Demesmin
Lumane Casimir
Lumane Casimir is the original singer of "Papa ghédé" which was then remade by Carole Demesmin in the early 80s and then remade again a few years ago by Naïka. Notice all 3 versions mention Lumane's name in the 2nd sentence of the first verse.
Naïka's version
Carole's version
Don't forget Toto Bissainthe.