For some answers to that question, see 1. here; and 2. here; and 3. here.
The Cross Conference website.
Scroll down to see Speakers, Schedule, Registration, Pray, Blog articles
Frequently asked questions.
I know some of my friends are upset with Dr. Piper for inviting Rick Warren (and Mark Driscoll earlier) [I agree that those were unwise decisions.] to speak at one of his "Desiring God" conferences (and never directly dealing with the problems and red-flags that Warren generates by his pragmatism, etc.); and also Piper's continualism of the miracle-sign gifts seems out of place with Reformed theology and there are a few other issues that we would disgree him on; but his passion for God and sound doctrine and missions is just so good, and so right; that I forgive him for his other mistakes.
About the Conference: Many college aged and young adult Christians are seeking guidance as to what God's purpose/vocation/career for their life will be. A great way to explore possibilities in missions is to go to the Cross Conference. (December 27-30) It will be in Louisville, Kentucky. It is especially designed for young people/ college and University Students, who are wrestling with the questions of what kind of career and purpose and vocation should they pursue and asking the question, "what are my gifts and how does my personality and giftedness fit into God purpose to glorify Himself in this world?" Even if you are not going to be a missionary who goes oversees or to another culture; the Biblical and spiritual atmosphere will be equipping you to glorify God better and walk with Him no matter what vocation or career God leads you to. The whole conference would also be very helpful for missions pastors and missions committee members and elders and pastors of local churches, in building their missions vision and motivation for their church. There will be many key missions speakers and pastors and workshops/break-out sessions. All of the "break-out" sessions explore issues that people, churches, and missionaries face, and some issues that non-missionaries are facing in our modern world, for example, issues of Islam, Islamic terrorism; and contextualization and how to understand those issues from a Biblical point of view.
See some of the key speakers: D. A. Carson; Conrad Mbewe; John Piper; Thabiti Anyabwile; Mark Dever; Al Mohler; Missionaries and nationals from the field; Kevin DeYoung; Mack Stiles http://crosscon.com/speakers/
Pray for workers/laborers for the field: (Matthew 9:36-38)
Praying for God to raise up more laborers for His harvest -
Please be praying for these students who come to the conference to keep on abiding in Jesus (John 15:1-16) and go and serve in their local home church, just as Paul and Barnabas did (Acts 11:26) for an extended period of time; and then as they were submissive to the elders/leaders/teachers as they worshiped the Lord and fasted and prayed, the Holy Spirit spoke and said, "Set apart for Me Barnabas and Saul to the work for which I have called them". See Acts 13:1-4 As they followed the Lord and the local church authority, when the church sent them out (verse 3), the Holy Spirit was sending them out. (verse 4) When a Biblical church sends out workers, the Holy Spirit sends out workers.