Easter, or Pasqua, is a very important holiday at the Vatican and in Italy. Easter Sunday Holy Mass is held in Saint Peter's Square, usually starting at 10:15AM. This is another popular and very crowded event. Admission is free but it is difficult to get entrance. If you go, get there early and expect to stand for a long time.
At noon the Pope gives the Easter message and blessing in the central loggia of Saint Peter's Basilica.
Easter marks the end of Lent so food plays a big part in the celebrations. Traditional Easter foods include lamb, artichokes, and special Easter breads, Pannetone and Colomba (dove shaped). Large hollow chocolate eggs that usually come with a surprise inside are popular Easter treats and you'll see them, along with Colomba, in many shop windows. If you want to try the Easter breads, buy one from a bakery. Although it will probably cost more, they are usually much better than the pre-packaged version.
Pasquetta, the Monday following Easter Sunday, is also a holiday in Italy but much more jovial than the solemn Easter week events. It's common to have a picnic or barbeque and many Romans head out of town into the countryside or to the seaside. At Castel Sant'Angelo in Vatican City, a huge fireworks display over the Tiber River ends the Easter week celebrations.