Android?iPhone app with he layout of the venue. Listing all the products and specials, tap a special or produce and it shows you were and at what stall you can buyI enjoyed it.
I disliked the long queues at the stalls although not much can be done regarding that.
I also disliked that I had no clue which shop to go to to look for certain things - such as coils for a certain tank. This took quite a lot of time as I had to wait in one long line only to be told they do not have any in stock and then to try a different store.
Some sort of online site for a list of the products each store has (and prices too if possible) would be amazing! We all have smartphones and it will save us all a lot of time. Might be tedious to set up though.
I struggled to find the stores I wanted and knew of, had to walk around to find them as opposed to just being able to look up and look around - since it was a smaller venue I thought it would be possible.