When requesting a show for the concert, please include the Vocaloids/Utauloids being included, what time you would like, and what songs will be in it.
You can only have a concert with other members. So don't request a concert just for your Vocaloids/Utauloids. If you do make a show in the concert hall, the other members must approve that they will be in the concert. The minimum is two members and the maximum is seven members.