With ASGA's support, you'll have many materials and resources to allow you to plan your own training retreat.
There may be professors and other administrators at your institution who could be facilitators for your retreat, or at least, help lead a few workshops or roundtables.
If you want a truly professional student government, you may wish to seek the help of an outside facilitator who is skilled to leading retreats and does this regularly.
ASGA's MISSION STATEMENT:
The American Student Government Association will provide all Student Government leaders and advisors nationwide with networking, research, and information resources and will teach them how to become more effective, ethical, and influential leaders on their campuses. ASGA also will promote the advancement of SGs, conduct research as the nation’s only “SG Think Tank,” and advocate the importance of having a vibrant, autonomous Student Government organization at every institution in America.