That is a tough one. If they are not receptive to begin with then confronting them yourself may just cause an escalated situation. Get the reps involved and take yourself out of it as much as possible.
On a side note: its hard to believe that there is not a meat, sanitization, and fire extinguisher inspection at the beginning of the event.
Movin' The Chains BBQ TEAM
Reverse FEC 100
Right Handed FEC 100
1 UDS and Chargriller Superpro w/ sfb (Retired)
KCBS & PNWBA CBJ