My first three letters are a term in golf,
While my second, third, and fourth are drawings.
My first four are less than a whole,
And all of me is a celebration.
Party
Par is the maximum number of strokes you should need to hit the ball in the hole.
Art can be drawings, sculptures, or anything of the sort.
Part is not a whole thing, so it is not a whole.
A party is a celebration.