There is also a old West Wing episode about presidential debate camp.
Basically, in college anyway, it's just like sports camp. Instead of practicing/lifting/studying plays all day you are on computers researching, breaking printers and doing lots of speaking exercises. My team easily killed a few forest with all the information we were reading, printing and filing away. We're talking huge storage tubs full of files.
(I'm not a total nerd, I was a college athlete in my pre-debate life. I can attest to the odd similarity.)
In the end, I preferred debate camp.