Samhein marks the onset of winter, and is the Pagan festival of the Dead - where we remember the ancestors, friends and relatives who have gone before us.
To celebrate as the Druids did, make incense with Wormwood, Jimsonweed, hemp and if you can fined it Nightshade.
The official drink is fermented apple cider. It has three gallons of fresh apple cider, one heaping hand full of wormwood and a hand full of pumpkin or gourds flowers. Ferment it, without adding any sugar, and then bottle it. For extra fun, prime it and bottle it as a beer to get a sparkling cider. It will be a dry cider, with a hint of wormwood flavoring.
This is the day the dead can come back to our world. To this day, I have never seen any spirits. Use your jack-O-lantern to keep out evil spirits and blue light to attract positive ones.