It was a potluck dinner and we were asked to bring either sandwiches (white food on plate), pizza, or empanadas. These sandwiches are 3 layers and usually have ham on one of the layers with lettuce or tomatoes or eggs or something like that on the other layer, then they're stacked on top of each other. They're called sandwich de miga. The pizza is cheese - mozzarella - with a green olive (seed included) on each slice. That's an extremely common kind of pizza. These empanadas (below) were made with hamburger and were fried. You can get them with meat (hamburger), chicken, ham and cheese which are all cooked before frying or baking them. Or you can get a kind called árabe (Arabian) which has the meat uncooked before the baking or frying process. All are very common.
The dance was in honor of the Dia de Amorosos or Valentine's Day.