CHANJONG: children's day I play at home.

CORRECT: On Children's Day, I play at home.

CHANJONG; Foundation day  I play at home.

CORRECT: On Foundation Day, I play at home.

>>Don't forget to use prepositions. 'on' for specific days and dates. Proper nouns begin with a capital letter. A comma is placed after prepositional phrase that is written at the beginning of a sentence.