Happening (noun)

1. An event or occurrence, especially one that is unusual or of some importance.
2. An occurrence or series of occurrences that happen, especially a significant or exciting event.

Origin:

Mid 20th century: from happen + -ing.

Examples:

1. The happening was a wild and energetic celebration of the arts.
2. The happening was a gathering of artists, musicians, and poets to share their work.
3. The happening was a spontaneous outpouring of creativity and energy.
4. She loved to be a part of the happening and be surrounded by the excitement and energy of the event.
5. The happening was one of the highlights of the city's cultural calendar and attracted thousands of people.