Birthday surprise!

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Across
  1. 2. used to refer to specific or particular nouns
  2. 5. the anniversary of the day on which someone is born
  3. 9. the most populous city in Illinois
  4. 11. (6x8)-(6+7)
  5. 12. natural flowing watercourse
  6. 13. clever or apt humor
Down
  1. 1. 9th month in the year
  2. 3. a meal eaten in the evening
  3. 4. to grasp and hold on to
  4. 6. a period of 1,000 years
  5. 7. move at a regular pace by lifting and setting down each foot in turn
  6. 8. an establishment that provides paid lodging on a short-term basis
  7. 10. a large public green area in a town, used for recreation