Pianos outdoors to play in Prague in Summer

I would like to know if there is any way to find out where there will be pianos out to play in Prague in public places, Thinking of visiting next Summer, and wondering if there are any kind of pianos scattered about such as in London to play, Do so want to play some Nick Drake outdoors on a very good piano in Prague or Budapest next July. Or any open mics that have a piano and maybe PA. Any suggestions appreciated. Orv
http://www.youtube.com/watch?v=huyx82dZl7k

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