I'm with Jings. My DS died on Easter Sunday. Her death clouded several Easters but then we got back to enjoying them, DS is now remembered with a toast to 'Absent Friends' and happy talk and recollected memories. Sadness doesn't come into it.
Death is an inevitable part of life. Few people over 15 will not have experienced a family bereavement. There will always be times when a tragedy, personal or public will overhang a happy occasion, but I do not see any reason why every happy occasion should have to have a resident doom-sayer to cloud the occasion.
Of course I will remember DM tomorrow, but with a smile and a giggle, she was a great giggler, and no tinge of sadness.