Merry Christmas, Charlie

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Across
  1. 3. Maddie Dawson
  2. 4. That river by the Hatch Shell
  3. 8. Kids' singing group founded in 1970
  4. 13. An early interest for Charlie
  5. 14. think[box] name
  6. 15. A highlight at Hemlock Gorge
  7. 16. Legendary Viking warrior
  8. 17. AKA stolons
  9. 20. It's on East 115th St.
Down
  1. 1. What Dave offers
  2. 2. CGC honcho
  3. 4. The Land
  4. 5. CASE mascot
  5. 6. Boston MLS team
  6. 7. It needs a cable, pulley, harness & gravity
  7. 9. Computer, in French
  8. 10. Groban or Brolin
  9. 11. You need a license for it on the Boston Common
  10. 12. Guitar named after a battleship
  11. 18. It means "turning" in Arabic
  12. 19. It's not pizza