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In Colombia, the most famous Semana Santa celebrations take place in Popayán and Mompox, where the Spanish colonial forces built six churches and a chapel, all used in the Semana Santa observations. The events begin in Mompox the Thursday night before Palm Sunday, when celebrants, headed by Nazarenos dressed in turqouise robes, arrive at Inmaculada Concepción Church and throw stones or kick at the doors to gain entry. Once inside, their robes are blessed in a mass, after which the participants proceed to San Francisco Church. The next morning, the events begin at 4 AM with mass at Santo Domingo. Church, followed by more rites at San Agustín and Inmaculada Concepción churches.

Palm Sunday begins with mass at several churches, blessing of the palms at Santa Bárbara, then a procession, commemorating Christ's triumphant entry into Jerusalem, to Inmaculada Concepción.

Monday through Thursday of Semana Santa are taken up with religious processions, retreats, sermons and other celebratory events.

On Thursday, the Last Supper is reenacted, following by the Viernes Santo (Good Friday) crucifixion with masses and solemn rites.

Sábado de Gloria, or Saturday, is filled with anticipatory prayers and rites, processions and religious fervor. Domingo de Resurrección, (Easter Sunday) is a joyous day with masses, Eucharistic rites and processions.

In Popayán, a religious and cultural center since colonial times, Semana Santa is an all-out celebration. In a town known for the ratio of churches to residents, the week long events include religious processions and masses, with a number of residents playing the treasured roles of religious personages.

Held at the same time, the Festival of Sacred Music joins together orchestras and choirs of several countries.
 

Programación de música

Horario de Semana Santa

Video de Popayán Video del desfile de Semana Santa

The above information comes from Yahoo Answers.