Conviviality (noun)

1. The state or quality of being sociable, friendly and pleasant in company.
2. The state or quality of being lively and enjoyable, especially when in the company of others.

Origin:

From the latin word "convivium", meaning "living together" and "ity" which is a suffix indicating the state or quality of being.

Examples:

1. The conviviality of the gathering made it a very pleasant evening.
2. The party had a great conviviality, everyone was laughing and having a good time.
3. The atmosphere was one of conviviality and everyone enjoyed the occasion.
4. The conviviality of the group made it easy to get to know each other.
5. The conviviality of the restaurant made it a popular spot for socializing.