Wow...SMH is on the ball here!
A great little article hit the front page (of the website) on underground dining. They comment that its appeal is in the intrigue of the unknown, community building spirit and getting to meet new people. It's also about giving 4th/5th year apprentice chefs a chance to show their skills and get away from high pressure demanding 5 star restaurants for at least a night
Check out the link...here