Merrymaker (noun)

1. A person who takes part in or causes enjoyment or celebration.
2. A person who makes merry, is jovial, or is fond of festivities.

Origin:

Middle english: from old english myrgenmǣg "companion of the morning", from myrgen "morning" + mǣg "mate".

Examples:

1. He was known as the life of the party and the biggest merrymaker.
2. The group of merrymakers danced the night away at the ball.
3. She was a notorious merrymaker and was always up for a good time.
4. The merrymaker brought joy and laughter wherever he went.
5. The village was filled with music and laughter as the merrymakers celebrated the harvest festival.