Well first of all let's tackle one problem at a time. The grub you are bringing can be easily stored in Baker's Sto 'N Go containers. Cakes, cookies, cupcakes, dips, deviled eggs, brownies and more can be transported effortlessly in these uber cool designs.
As for the wasps, you can capture them (not kill them) in a new organic trap. Keep those pesky stingers away from your food and guests and relax! You deserve it!