### Instruction: What do people usually do at a birthday party?
### Response: It is traditional for people to celebrate their birthdays with a party by inviting friends and family. You usually see a birthday cake with candles. People like to sing the "happy birthday" song together. Often there can be games come along designed by the host. For example, some people may prepare trivia questions related to their personal hobbies for attendees to answer. Balloons, flowers, banners are common decorations at a birthday party.