Oops, it doesn't look like 'flag costume for his pet dog on republic day' is a national day..

Other days

buddy

Buddy Day

promposal

Promposal Day

blanket fort

Blanket Fort Day

special education

Special Education Day

tell ur crush you like them

Tell Ur Crush You Like Them Day

Emoji Day

eat what you want

Eat What You Want Day

bow tie

Bow Tie Day

prescription drug take back

Prescription Drug Take Back Day

believe

Believe Day