According to the 7th Avenue Homepage, there is a Copy Band event on Saturday 13th. With TERASEA (I think, Kenta will be the Drummer) and Tamako Band (with Tamako and Yamaryu). Gurimon hasn´t confirmed anything yet, so its still a guess. I have included the picture below.
Just a little edit: Tamako told me that she and Kenta are Tamako Band (Yamaryu is not coming this time ) I´m not sure if Kenta is still the Drummer for TERASEA, but I think yes.