Here is the link to the UIFI that BabyPiNK_FL noted above. As well as another leadership institute, IMPACT, that is provided by the NIC.
The Undergraduate Interfraternity Institute
More than 4500 students have participated in the premier leadership program for Greek leaders: UIFI—the Undergraduate Interfraternity Institute. UIFI provides a unique experience found at no other program. UIFI offers you the chance to refine your leadership style. You'll leave UIFI a more polished leader, knowing what you want to do and how best to do it. Your session of UIFI becomes your own chapter as all attendees and facilitators live together in a Greek chapter house. Through late-night conversations to the closing "passing of the gavel," you'll be making new friends for life.
IMPACT - Campus Leadership Institute
IMPACT is the NIC's campus leadership institute that will help your fraternity and sorority community move forward and attain great success. IMPACT is designed to foster improved relationships among campus Greek leaders through a two-day intensive, interactive curriculum that emphasizes leadership development, positive change, values-based decision-making, and coalition building within the fraternity/sorority culture. Contact the NIC to learn how you can bring IMPACT to your campus.