1. Semana Santa

The Buzz -- Each spring, from Palm Sunday to Easter Sunday, Mexico celebrates Holy Week. It's second in significance only to Christmas in the Mexican Catholic calendar, so the festivities are particularly colorful and lively. Along with numerous religious services, ceremonies and reenactments, people plan elaborate fiestas. These usually include parades, picnics, family vacations, and plenty of cascarones, brightly dyed eggs filled with confetti. If you're in Mexico at this time of year, expect at least one of these babies to be cracked over your head!