Allow me to mention my experience with Carnival of Tears.
It was memorable. It created memories.It was wonderful. It provoked wonder.
It was fantastic. It created fantasies.
It was glamorous. It projected glamour.
It was enchanting. It weaved enchantment.
It was terrific. It beget terror.
The thing about words is that meanings can twist just like a snake, and if you want to find snakes, look for them behind words that have changed their meaning.
No-one ever said the Carnival was nice.
That carnaval was bad. </Pratchett>
I introduced it without changes a few months after founding the kingdom. Since the module is designed for level 5 characters, the insertion must be done quite near the beggining of Kingmaker 2.The Capital city was rather small (every campaing will have between 200 and 500 inhabitants, depending in how the players manage the improvements the first couple of months available). Then, this Carnival arrives. The adventure unfolds and the tragedy begins. My players were excited at the beggining of the adventure (they thought it was going to be a murder/detective adventure involving evil clowns or something similar). Now, a year later in-game, they refer to the events as "the Carnival of cannibal Carnage", or "the cruent and cruel carnival" both in English and Spanish (our mothertongue).
It's plain mean to involve a nascent city with such a deadly adventure, knowing that a large percentage of the population will die even in the best case scenario. In order to diminish the impact, you have to change most of the key scenes, or change death for maiming...
It's not a bad module, and I don't regret using it; but I know that if I had thought it deeper, I wouldn't have chosen this particular module.
On the other hand, now the Stagfall city, capital of the Prozor Kingdom, has Gradzaal "Raúl" the Minotaur as the Executioner, the rogue got Whisper and Shadow, the Summoner got Wyvernsting and the party could apply their newfound knowledge about quicklings (Rigg Gargadilly) in order to capture, imprison and execute a jumpy Prig.