is there an hbo free preview weekend coming up soon?
 

i just got home from college and my parents got comcast on demand and i was wondering if there was a preview weekend coming up so i could watch shows like deadwood and carnivale

they had one couple of months ago

do they usually announce beforehand a preview's coming up?

i would think they would advertise it to get more people to tune in and then potentially order hbo, but i'm not sure