There are several threads about busking here. I think you are wandering a little off subject, here, because this thread is really a discussion of what amplification is suitable for buskers.
The main thrust of your post, as I read it, is that you need to know how to make your local authority realise that good busking can be an asset to your city. This has certainly been mentioned in passing elsewhere, but it may be time to have a thread dedicated to this subject. Why not start one?