MCBIM '3 Oktober' Holiday Crypto Puzzle

1234567891011121314151617181920212223242526272829
Across
  1. 2. Purification in Excel (6)
  2. 4. A toxic singer (6+7)
  3. 6. Black dog (7)
  4. 10. This is what you get when you evaporate Alfred N. (5+3)
  5. 11. A collective of bodyguards (10+5)
  6. 15. The only thing you should eat on Leidens Ontzet (7)
  7. 17. Our newest doctor (8)
  8. 18. The Bromine + Barium show (7+3)
  9. 19. Concentrated smoking (10)
  10. 20. Will make your hair very cold (11)
  11. 22. Nuclear reaction that makes beer (5)
  12. 23. Country with three times more babies (7+5)
  13. 24. 400 alphabet (1+1+2+1+2+2+3)
  14. 25. Old-fashioned hat (6)
  15. 26. The Dutch one (5)
  16. 27. Something both acrobats and chemists use (7)
  17. 28. A music genre that needs to lose weight (5+5)
  18. 29. The Ukrainian one (5)
Down
  1. 1. Easy to offend (14)
  2. 3. Marie's favorite Indian dish (5+5)
  3. 5. The sound extraterrestrial pirates make (6)
  4. 7. 'Adventure of a ...' - Coldplay (8)
  5. 8. Reoccurring furniture (8+5)
  6. 9. When your pet breaks your compound (9)
  7. 12. A rotten tomato (3+5)
  8. 13. Where pears talk about research (10)
  9. 14. David van Goorle's house (8+8)
  10. 16. A feminine pipe (7)
  11. 21. A rare Russian (9)