Fest (noun)

1. A festive occasion or celebration, often with music and dancing.
2. A gathering or event, especially one that is large and organized for a specific purpose or group of people.
3. A feast, a big or elaborate meal.

Origin:

Shortened from festival in the late 19th century.

Examples:

1. The music fest was a huge success this year.
2. The annual Oktoberfest is a big fest in Germany.
3. The college had a fest to celebrate the end of the semester.
4. They had a grand fest for the wedding anniversary.
5. The company had a fest to celebrate their success.