Semana santa is, along with the Christmas season, the most important Catholic holiday in Mexico. Throughout the country there are solemn but colorful parades, Mass, and often fireworks. Especially well-known for their elaborate or unusual ceremonies the week preceding Easter (especially Thursday, Friday and Saturday) are Oaxaca, Oaxaca; Taxco, Guerrero; San Miguel de Allende, Guanajuato; and San Luis Potosi, SLP, but there are elaborate processions and other events in myriad cities and towns all over the country. Easter Sunday itself there are few if any activities, it’s a day to spend in church and with family and friends.
Semana Santa is also a time when half of Mexico flocks to the beaches---a Mexican spring break. Be sure if you want to travel during this time of year to make hotel reservations as far in advance as possible.