Antipasto, which means "before food" in Italian, is a salad-like appetizer consisting of various fresh and pickled vegetables, cheeses, and rolled or sliced meats. For vegetarian antipasto, you can either substitute mock meat products or leave them out altogether.
There are tons of possible pizza toppings / calzone fillings and even more combinations. Here are some ideas for delicious vegetarian and vegan pizzas and calzones.