What would a Roxy weekend consist of?
I've been to Bowie conventions in the past. They usually involve a few stalls selling collectible records/CDs/memorabilia, a quiz with donated prizes, perhaps a room with a large screen showing rare videos, and a live band and/or disco to finish. A pub or hired function room usually serves as the venue.
Perhaps one of the Roxy tribute bands could provide the evening's entertainment. Not sure if there are enough specialist Roxy dealers to muster up even one stall, mind.
I fear Roxy don't have enough hardcore followers to make such an event a success. If it were convenient, I'd pop along, but I wouldn't be prepared to travel any great distance. It would have to be a labour of love for whoever organises it; they would need to be prepared to spend/lose a chunk of money to make it a reality.