n. a polite written or spoken offer for someone to attend an event, perform an action, or go somewhere
He gave his friends his birthday invitations.

n. a baked cake for celebrating one's birthday
I stuck candles in the birthday cake.

n. _
Girls love mermaid costumes for Halloween!

n. something presented as a gift
There was a big present under the Christmas tree.

v. to make something pretty or fancy by adding an ornament, color, etc
It was Stella’s job to decorate the room for the surprise birthday party.

n. a social event often with food and drinks and dancing
Can you come to my birthday party?