Asking the hostess to reheat your dish in a 350°F oven for 17 minutes is so much worse than bringing nothing at all.
1) It travels well. If it won't make it through an hour on the passenger seat of your car while you swerve through summer traffic, it doesn't make the cut.
2) It can be stored and served at room temperature. Heating it up when you get to the party is too much of an imposition on your host. And, refrigerator space is limited and, frankly, better used for beer.
3) It doesn't take long to make. You have a party to get to.
Sweet Corn and Roasted Jalapeno Hummus
Blueberry Pie Bars
All the deliciousness of a pie without the fuss of crimping a crust. Recipe here.