Want to do some REAL damage at the convention????
Print out a few copies of notices saying this, "The faithful and discreet slave has directed that everybody should use atleast THREE paper towels to properly dry off their hands."
Have tape already on the sheets and hang out washing your hands, combing your hair, etc, and when nobody is watching swap out that one w/ the other sheet taped on the papertowel dispenser that says only 1 sheet.
You'll bankrupt the district convention doing that :)