Tonight, I was attending a formal ball. While getting dressed, I realized that my "normal at home" EDC would not be appropriate.

I pulled the following together as EDC for this formal in-town event:

Small zippo lighter (with enough fluid for 1 night)
Money clip w/2" knife, 2" nail file, and very small scissors
White handkerchief
Cell phone w/all of it's bells & whistles

The hint of the day: Always get the suspenders for the tux so your pants won't slip downward.
The best luck is what you make yourself!