Research man, you need to do lots more research to find out just how many you are going to serve. With that big a number, being off could be very costly. This event has been going for a long time so someone should have a pretty good idea of the number. Remember, not all will eat and many of those folks eat very little.
Good luck with this.
Senior member of the Brethren
Weber Platinum Kettle, Weber OTS, Meco square grill, ECB, UDS, WSM, a cool fold up camping grill, Blackstone flat top camping stove, The MOAB, and now the proud owner of a YS640, MOINK.
Pitman for All Things BBQ cooking classes.
Smoke on Brother KC
Father of the Fatty (the name) 4/20/04 on the BBQ Brethren with inspiration from Brother parrothead.