Since you say something more connected to Bitcoin, how about like a Bitcoin education center? You could offer workshops and courses and probably one-on-one training on Bitcoin (how it works, what to do, what not to do, etc). I haven’t thought so indepth about it but maybe you can think about it and work with it. It mustn’t be something huge too. It could be in your store and you don’t have to actually call it an education center. You could print handouts to give to some customers too.