Canadian Holidays On Calendar

Why does the calendar show all the Canadian holidays except Albertas? For example August 2, 2021 the calendar showed:

Natal Day for Nova Scotia

Terry Fox Day for Manitoba

New Brunswick Day

Civic Holiday for Nunavut, Northwest Territories, PEI & Ontario

Saskatchewan Day

British Columbia Day

but nothing for Alberta’s Heritage Day.

It’s like this all year long! So frustrating for us Albertans!