Secular holidays

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Across
  1. 6. Gratitude.
  2. 7. Heated discussion.
  3. 8. Celebration.
  4. 9. Try to seduce.
  5. 10. Illuminate.
  6. 11. Require.
  7. 14. Serve (drink).
  8. 15. Origins.
  9. 17. Fill with (cooking).
  10. 18. Permit.
  11. 19. Not religious.
  12. 20. Commemorate.
Down
  1. 1. Custom.
  2. 2. Romantic meeting.
  3. 3. Want somebody to have.
  4. 4. Based on faith.
  5. 5. Go to parties.
  6. 12. Alter appearance.
  7. 13. Almost the same.
  8. 16. Cut, slice.