1. the quality or state of being festive; a cheerful and celebratory mood or atmosphere

Examples

• The festiveness of the holiday season filled the entire neighborhood with joy.
• The decorations added to the festiveness of the celebration.
• Despite the rain, the festiveness of the party never diminished.
• The children's laughter contributed to the festiveness of the gathering.
• The town square was alive with festiveness during the annual fair.
• Her infectious festiveness made everyone at the event feel happy.