Montressor and fortunato are wearing costumes because it is carnival time.
one reason montressor is wearing a costume is to be sure no one recognizes him when he is walking back to his house with fortunato.
fortunato was a competitive person because he got jealous when he thought luchesi was going to taste the amontillado.
montressor leads fortunato down into catacombs where many people were buried.
montressor and fortunato were down in the catacombs until midnight.
montressor was upset because fortunato had seriously offended him and wanted revenge.
no one ever found fortunato, who montressor buried alive down in the catacombs.
montressor kept giving fortunato wine because he knew he could not resist it and wanted fortunato to keep following him.