Other than the fact that they are both "arts", the performing arts and visual arts really don't have much in common. They are both considered "arts" in society because they are labeled as "displays...
A lot of things between the Greeks and the Romans are similar because the Romans copied a lot of Greek ideas. For instance, the Roman and Greek gods. They are the same gods, just with different names.
art exhibitions are something within a gallery that comes and goes. A gallery is permanent and can hold exhibitions within. Also some exhibitions can be outside.