Make some time this week to check out this great resource from Pennsylvania State 4-H: Penn State 4-H Teambuilding Manual. This might lend itself to a nice training for volunteers. In particular I found the Comfort, Growth, and Panic Zone graphic helpful as well as the entire Experiential Debriefing section.
Check it out at: Penn State 4-H Teambuilding Manual
Florida 4-H: Northeast District 