Why do peopel laugh?

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123456
Across
  1. 2. you turn it on when it's dark in the evening
  2. 4. Chinese New Year
  3. 6. make things look beautiful and special
Down
  1. 1. a great dinner with family and friends on holidays
  2. 3. ice-cream
  3. 5. a thing you give someone on their birthday or festival