Since long time ago, Xiaomi loves to restrict the best features only to some regions. I'm using an India region to have FaceID on my Redmi 5 Plus, but these annoying holidays in calendar are p****ng me off. I tried this, this and tried doing the opposite of this, nothing. There is no option as "Show Holidays" for me, only an option to display India letters under numbers if you have selected that language. I really loved the old Calendar on Redmi Note 4 with Polish region set.