A celebratory event or atmosphere is one that's filled with excitement and joy because something special has happened.
When we talk about something being celebratory, we usually mean it's marking an occasion like a birthday, wedding, graduation, or even just a fun party. It's often used to describe the mood or feeling of the situation. For example, you might say "The fireworks display was so celebratory" to convey that it added to the excitement and joy of the moment.
Having the manner of, or forming part of, a celebration.
