Pastors, artists and other Christian leaders will join this weekend at the University of Miami for the One Conference, three days of rallies, music and motivation to affect South Florida for the faith. With megachurch pastors such as Brian Houston and Greg Laurie, the conference is set for Feb. 10-12 at UM's Bank United Center in Coral Gables.

They’ll tackle dire issues like human trafficking, fresh water for Haiti, Bibles for "unreached" people groups and how to respond to crises. But first importance will go to simple unity.

"We're all different, but we're of the same substance," says Pastor Bob Coy of Calvary Chapel Fort Lauderdale, who will be one of the 15 scheduled conference speakers. "Anytime pastors get together, that’s good. Translating it into partnerships is difficult. But it's healthy to get to know each other."

Besides Coy and Graham, the planned speakers include:

The Rev. Pedro Garcia, the host pastor and spiritual leader of Calvary Chapel Kendall. Garcia, who became a Christian believer in 1996 at Calvary Chapel Fort Lauderdale, is the founder of LIFE Radio (90.9-FM), which broadcasts to Miami-Dade and the Florida Keys.

Greg Laurie, pastor of Harvest Christian Fellowship in Riverside, Calif., and founder of Harvest Crusades. Laurie led a crusade in Fort Lauderdale in 1995 and spoke at a Promise Keepers rally in Miami two years later.

Scott Harrison, founder of the nonprofit organization charity:water. His group has funded more than 3,800 water projects, providing more than 1.7 million people with clean drinking water.

Brian Houston, founder and pastor of Hillsong Church, which includes congregations in Sydney, London, Capetown, Paris, Stockholm and elsewhere.

Rich Wilkerson Jr., who runs a gathering in Miami called Vous. His ministry aims to infuse the gospel in music, teaching and the arts.

Garcia's wife, Lourdes, is serving as "cause coordinator" for the One Conference. She cites an estimate that 27 million people are enslaved worldwide and 100,000 American children are trafficked for commercial sex annually.