I guess this is a good time to work out what each department needs. Painting judges: what do you need? What could a could a volunteer do for you and still get time to play?
Flames of war?
L5R?
Warmahordes is a self contained module (being the Texas Renegades) but could use help with set up and tear down.
40k: what do you need? How are judges vetted?
Registration: ?
Operations (announcements, prize support, people behind the table in the Command Centre): what do you need?
I'm assuming most of these departments just need a Gopher, with some needing a person to rotate and cover a spot (registration, scores collection)
This is a gaming con, it doesn't need a huge staff to run (unless Pannels And classes are added, then you'd need a teacher and a gopher for each)
What is a gopher? It's a person who's job is to Go For things. Be it food, bags, finding Larry or John, whatever.