I need some assistance.

I believe that the saying;
“Onto every parade, some rain must fall.”
Was created ‘whole cloth’, by me.
I’ve attempted to look it up, and all I can find is Longfellow’s
Rainy Day:

“Be still, sad heart! and cease repining;
Behind the clouds is the sun still shining;
Thy fate is the common fate of all,
Into each life some rain must fall,
Some days must be dark and dreary.”

I also have found the phrase ‘Rain on your parade’.

My lovely bride claims she has heard it before. It’s just too pithy to be my creation…🤨