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Yep. Call the insurance guy. If you have a decent underlying policy, 1 meg of umbrella coverage is pretty cheap. Be sure to tell him what you are doing because there may be exclusions and other terms buried deep within the fine print of the policy. The policy is nothing more than a legal contract, and like all contracts, the devil can be in the details. Might not hurt to consult your attorney.
We used to be able to get an event policy from a company here in CA - you might want to check into that. It used to cover over 1M and was only around a $100. We only did 6-8 events per year so it was worth the $$