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hang out a shingle 

Verb phrase. To start a business.

This refers to old shops or guilds in the 1800's and before, where their business name was carved on a piece of wood called a shingle, which they would hang out over their front door for pedestrians to see.
"Your sister graduated Law School last week? When will she hang out a shingle?"

National hang out with a boy/girl day 

If you have a crush or boyfriend/girlfriend then this day is for you.
National hang out with a boy/girl day is all about you crush or boy/girl friend. Just hang out with them for as long as you like.