you are scheduled to do 2 completely different things back-to-back on a saturday night, and you have to figure out what to wear. party #1 is a formal shindig, and you've heard that a good-looking celebrity of the opposite sex is going to be there. party #2 is a completely casual barbecue deal, and you've heard that a member of the opposite sex whom you've had a crush on for a while is going to be there. the parties are back-to-back, and there will be no place and no time to change.
would you:
a) dress casual for the whole night, or
b) dress formal for the whole night?
would you:
a) dress casual for the whole night, or
b) dress formal for the whole night?