If you need more than one minute under just about any conditions to initially evaluate the sound of the system - it is no good for you. No, not a place for critical listening, but as others have said that's not the goal of the shows. Just like a great live performance - people can talk or scream, and it will be distractive, but you will know that the performance is great.
RMAF Etiquette
I have only attended RMAF once in 2014, however, I found it very difficult to evaluate systems due to background noise. The majority of times I would try and listen to a room I found the vendor speaking loudly to attendees/friends. I understand the need to speak to somehow because this is a social gathering of sorts, however, i found it very difficult to hear the equipment. I cannot be the only person that has experienced this problem. My hope is that people may read this and think before they start a conversation in a listening room at RMAF. I am very hopeful to find some new loudspeakers this year and be able to do so in in relative silence.