Visiting Prague, any event, tip ?

Hi all,

I come from Paris and I will attend a professional meeting in Prague on Friday, 25/03/2010. I decided to stay during the week end. I would like to see more. It would be nice if there would be an event during the week end ? I already know some places in the city, since I have been there before maybe 5 times. I am interested in any tip to visit the city or the next surroundings on Saturday. Thank you for your answers.