I would view it as three separate catering jobs. I am not sure I would do it, to begin with. But, three separate jobs, and work the numbers from there. I think even at $9 a plate, it is not bad money. I would guess you could walk away with what, $250 to $300 or so, after expenses, not bad for a long day.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."