8. In an Accessory-Shaped Flask
These guys work best in tandem. Get at least four of these things ready the night before the debauchery and weed them out depending on the forecast. No rain? Ditch the umbrella. Skipping the parade and going to the bar? Leave the binoculars at home (unless you are some kind of pervert, which is cool). Smoke free venue? Maybe lose the lighter. And if worse comes to worst, you can hide your booze in a baguette. There's never a reason you wouldn't have a baguette.