Why is dusk during the carnival season an effective setting for the part of the story in which Montresor begins to lure Fortunato to his doom in The Cask of Amontillado?

Dusk during the carnival season creates an atmosphere of mystery and revelry, making it easier for Montresor to conceal his true intentions as he lures Fortunato to his doom. The chaotic and crowded nature of the carnival provides Montresor with opportunities to mask his sinister motives and take advantage of Fortunato's festive and carefree mood, ultimately setting the stage for the unfolding of his malicious plan.