Historicaly Yojimbo were bodygaurds for female attendees over the years we addoppted a more general role of not exactly security but peacekeepers.
As a Yojimbo i helped orginize and kept moving registration lines, event lines, and more lines that i am not even sure what they were for. I walked around the dealer hall and made sure things went smoothly both when there were lots of people and when the room was empty save for the curtains that move and mkae funny noises when you are not looking at them.
Yoji lookout for people who need help and also for people who may or may not knowingly be breaking a con rule.
most importantly yojimbo shower every day.
so ya thats yojimbo, theres more to it than just that though if ya have any other questions just ask.