8/2nd's diary! Today is my parents' birthday!?

Today, my family held birthday party! Today is not anyone's birthday of my family. July 30 is my father's birthday, and August 7 is my mother’s, so my sister and I planned their birthday party today. I made keema curry and my sister maid nan. I bought some spices for today. These were ALL SPICE, TURMERIC, GARAMU MASARA and CHILLI POWDER. I made it in earnest and I became happy because my parents said “It’s good” However, after the dinner I noticed one thing that my sister and I forgot to tell them that this is birthday party for my parents…
When I noticed it, it’s too late to tell them.
Why I cooked curry today!? (T_T) [115 words]