make a day of it
Also, make a night of it. Devote a day (or night) to some pleasurable pursuit, as in Now that we're at the beach, let's make a day of it, or Since they missed the seven o'clock train, they decided to make a night of it. [Mid-1600s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.