Primo Maggio, May Day (or May first) is Labor Day in Italy, and while it was once the occasion for worker's meetings and marches, it's now more of a celebration, with free concerts and other events, and many choose to enjoy a picnic or barbecue. A couple of ideas, if you choose the picnic route:

Insalata di Riso: Rice salad varies tremendously from cook to cook, and is always satisfying.
Bowties With Chicken and Beans in a Spicy Sauce, or Farfalle Con Pollo e Fagioli in Salsa Piccante: A tasty, modern, and quite refreshing pasta salad.
Lemony Pasta Salad, or Insalata di Pasta Profumata al Limone: A tasty lemony pasta salad with plenty of tuna, which makes it a meal by itself (or with a green salad).
Panzanella: A Tuscan bread salad that's wonderful in the summer months.

More Picnic Foods | Other Pasta Salads