Final answer:
The mood of the party changes as the night progresses, but it is unclear if most people seem happy at the end of the night.
Step-by-step explanation:
The mood of the party changes as the night progresses. In the beginning, it is described as joyful, with revelry and colorful streamers floating in the air.
However, as the night goes on, the mood may shift and become less happy. Without further information, it is unclear how most people feel at the end of the night.
We would need more details to determine if most people seem happy or not.