You've heard of Father's Day and Mother's Day... but what about Kid's Day?
It's true that this holiday is somewhat recognized here and there. But by and large, as a society and culture we forget to celebrate the children in our lives.
While my family hasn't landed on a set day to celebrate, we did make a point to call yesterday 'Kid's Day'. More than a specific date I think the important thing is your attitude:
Kids are worth celebrating. You should do it.
And he took a child and put him in the midst of them, and taking him in his arms, he said to them, “Whoever receives one such child in my name receives me, and whoever receives me, receives not me but him who sent me.”
(Mark 9:36-37 ESV)