The "after" activity of the three day Cursillo weekend is known as the "fourth day".  During this time perseverance is important just as it is in any method of renewal.  In the Cursillo Movement the community spirit is continued after the three day weekend through the "Ultreya" or reunions of the community.  These are held as often as weekly as a means of growth in understanding and zeal within the Christian community.  Reunions of smaller groups of friends are also held in order for them to encourage one another in spiritual improvement and the Christian apostolate.

Christianizing Environments
The Cursillo is an encounter with Christ.  Correctly applied and overseen, the Cursillo Movement can have very positive results in the spiritual revitalization of the world.  The Christ-likeness in a few good people is contagious.  The transference of Christ's value to others in one's family, school, place of business, etc., is the Christianizing of environments the Cursillo promotes.  The goal of the Movement is that Christ be the prime influence in Society.  So it is said that the primary objectives of the Cursillo Movement are to develop in adult Christians a consciousness of their power and mission to become leaders in their work of Christian renewal, and to sustain them as they provide a Christian leaven in civic, social, and economic life.  This "Christianizing of environments" is what the Cursillo Movement is all about