Question about renting a condo?

I am currently finishing out a 12 month lease on a condo I have rented. My lease expires end of September. My landlord/condo owner is also a Remax realtor and he informed me approx 1 month ago that he would be selling the condo. My question is what rights do I have until my lease expires? He has listed the condo and put a sign out and has already shown the place a few times, asking me if I could leave for a while while the condo is shown. The kicker today is that I got in my mail a postcard that has the condo shown with a notice that there would be an open house this sunday from 1-3pm. He never even said anything to me about it....What the hell is this? Don't I have a right to privacy/live in this condo until my lease is up? I have friends coming over Sunday and now I have to deal with this......