I applied to grad schools this year. I haven’t heard from some of them but the one I was admitted to I was invited to come and visit. My understanding is that this is relatively common, but I would like a better sense of how common. 

I want to visit the school I choose before I make a decision on where to go. My question is: should I expect to be invited eventually for a visit day for the schools I am admitted to? If not then I guess I should plan a trip myself. 

To add to the context I will say that I believe I had a relatively strong application.