Party things

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Across
  1. 2. theme of this puzzle
  2. 6. opposite of inside and is where parties normally are Imo
  3. 7. a kind of party to celebrate someone that is officially done with school
  4. 9. often invited to birthday parties by the birthday person, often met or made at school
  5. 10. a certain reason to have a party for the anniversary of ones birth.
Down
  1. 1. uses helium and floats
  2. 3. can be a kind of food eaten during parties, you need a bun for it and common condiments are ketchup and mustard to be put on it
  3. 4. way of communicating someone can come to a party
  4. 5. at a birthday party these are put on the birthday cake, they either have the numbers of the birthday human's age now or that number of ______s on the cake
  5. 8. if a birthday party the birthday human often gets these