I think everyone remembers their birthdays for precious gifts, parties or having good time with friends and family, otherwise all birthdays are unbirthdays

Celebrating at Bargi Dam with Suketu and Harish
An unbirthday (originally written un-birthday) is an event that can be celebrated on any day that is not the person’s birthday. There is proper definition of unbirthday in Wikipedia though it is unlikely that you will find this term in dictionary.
I can have 364 unbirthdays therefore it is much more profitable to celebrate these days.



