You searched for: “samhainophobia
samhainophobia (s) (noun) (no plural)
A dread of Halloween or the fear of the festival of the dead: Mrs. Marsh feared the upcoming date of October 31 because she had the condition of samhainophobia and had a strong dislike of the revelry at the beginning of the dark period of the year with people dressed in costumes to disguise themselves, like ghosts intending to do harm.