Celebrate!

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Across
  1. 4. Costing a lot of money.
  2. 7. To reserve a place - for example, on a flight or at a restaurant.
  3. 8. To keep something in your mind.
  4. 10. This is tall, and it's cold at the top.
  5. 11. In the open air, not inside a building.
  6. 14. To show that you are happy about something.
  7. 15. The people at a party of celebration.
Down
  1. 1. There are a lot of trees here.
  2. 2. There's water all around this place.
  3. 3. A large building that was built to defend people.
  4. 5. In a different country, not in your own country.
  5. 6. To plan or arrange an event.
  6. 9. Worth remembering.
  7. 12. You live in this when you're camping.
  8. 13. The opposite of 'slowly'.