Why doesn't Apple's mobile phone display Father's Day?

Father's Day is not displayed on Apple's mobile phone, so Chinese mainland holiday was not selected. The selection method is as follows:

Operating environment: iPhone 12, iOS 14.4, calendar 1.0.

1. First, on the desktop, click the calendar to enter, as shown in the figure below.

2. Then in the new interface, click the calendar below to enter.

3. Finally, in the calendar interface, open Chinese mainland Holiday and click Finish.

Blessing father's message:

1, I give you infinite gratitude and warm wishes, as well as many memories and affectionate thoughts. Because your kindness is beyond words, I wish you a happy Father's Day!

2, the father loves, the stalwart is like a green hill; Holy as ice and snow; As warm as the sun; As wide as rivers and oceans! Happy Father's Day, Dad! Love your daughter forever!

Dad, you always express your love in the simplest way, but your love is enough for my whole life. Happy Father's Day!

Every time I think of you, I am extremely proud. You always inspire me to keep moving forward. On this special holiday, I wish you a happy Father's Day!

5. My father's teaching is like a lamp, illuminating my future; Dad's care is like an umbrella, sheltering me from the wind and rain. Happy Father's Day!