Xmas gathering

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Across
  1. 4. Letter 12-21-14-3-8 of the alphabet
  2. 5. Last month of the year
  3. 9. Song of Kool & The Gang
  4. 10. The most wonderful time of the year
  5. 11. ...to the world!
Down
  1. 1. Expensive sparkling grape juice consumed by classy individuals. Requires good vibes
  2. 2. number of people working in the Library
  3. 3. You are mostly...
  4. 6. Information Unit
  5. 7. Santa's famous words
  6. 8. Best boss ever (keep in mind: he pays the drinks!)