Where does Halloween come from?

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Across
  1. 2. カブ
  2. 4. honor as holy
  3. 7. 取り付く
  4. 11. the middle ages (2 words)
  5. 12. ちょうちん (singular form)
  6. 13. 祈り (plural form)
  7. 14. shortened version of a word
Down
  1. 1. 組み込んだ
  2. 3. 習慣
  3. 5. ケルト人
  4. 6. mythology; oral history
  5. 8. お菓子
  6. 9. scare
  7. 10. 物乞い (plural form)
  8. 14. 彫る