There are a number of sites that can tell you when the ISS will be visible. Here are 2. I find that this is a good way to get people interested in astronomy as well since they can see this on a predicted path at a predicted time. You see it naked eye but you can also track it with binoculars. I have never tried to get it in my scope.
https://www.google.com/url?sa=t&rct=...39782543,d.eWE
https://www.google.com/url?sa=t&rct=...39782543,d.eWE