Halloween by far is my favorite, its totally my aesthetic, has candy, and I just love the costumes <3 Ironically I don't like horror movies or anything though XD
Then Valentines, cause I'm a sucker for pink and red color schemes, also has candy, and I love romance and am a hopeless romantic. Even if I'm not in a relationship at the time its still one of my favs.
And last but not least is Christmas, not just cause of the gifts but when I'm finally out of that Halloween mood I really love the mood around Christmas as well as visiting family and giving people gifts if I have the money.