conviviality

noun2

1. •
   The state of being convivial; a feeling of comfort and happiness, as from celebrating casually with friends.

   • He's easy to talk to because of his conviviality.
2. •
   A jovial activity or spirit, marked by easy and lively socializing; a hospitable and festive atmosphere.

   • We're old friends, so once we started talking, the evening gained an air of conviviality.