I think the best chance for something like this to work is to have it as part of one of the established regional audio shows like RMAF. The headphone guys did this with Can Jam and it has been a huge success. I've been to the last 9 RMAF's and there is a ton of vinyl there -- Acoustic Sounds, Absolute Vinyl, Elusive Disc, a la carte productions, & Music Direct. Also, there are a lot of TT, phono stages, & different cartridges in many of the rooms. You need someone to take charge, organize it and promote it. That will be the hard part--finding that someone or company to try to organize and promote the event. I think Chad Kassem might be a logical place to start to see if he has any interest.