Celebrations are great. In some countries there are certain national celebrations for special events.
I think celebrating birthdays, anniversaries and personal times give us a great sense of being.
It is a wonderful break from normality to have something special to celebrate and in this event, it marks the momentous occasions for the participants.
Celebrations bring unity and it is a wonderful thing to step outside normality and be a little jolly for some very special dates.
Celebrations are good for your well being so enjoy them when you can.