My Guess, DEFINATELY won't know until that day. After reading the flyer from the barn " Nitro vehicles are also permitted on this race day" And racing with some of the local's in CT last year, There will be gas as well.
Although the smell / noise of nitro bothers some "electric only's", I doubt the hum of the electrics will bother the "nitro only's".
Plus....Some of them "nitro's" are still trying to prove "gas is faster"