Hmm that might be a very difficult thing to do as a bitcoin user no? To just encourage a business to accept bitcoin you need a lot of convincing power and proof that it's profitable for them.
I wouldn't know how we could reach this together but I do hope it happens.
You really need to encourage them indeed but I think with sone good words its already possible and they just have to look it up and they will see why its than a pretty good currency to use and also to hold.
You need for researching about some fact in the environment of the store before giving a suggest to the store for accepting bitcoin and I just say this for preventing if there is not enough bitcoiners in the environment and why the store are really need for accepting bitcoin?