On days August 12, 19 and 27 will happen quadruple phenomena of the galileian satellites of Jupiter. The shadows of Europa and Ganymede will be simultaneusly in transit. www.pierpaoloricci.it/eventi/giovedoppi_eng.htm
Years ago, I saw one of those events through a 24-inch reflector telescope. (Europa and Io, I think) It was pretty awesome! Please Register or Log in to view the hidden image!