It would be very helpful to have a feature that prevents joins / hides the instance upon creation of instance, but still allows people to be invited in. Example: a music event that fills up in an INCREDIBLY short amount of time wants to use the group system needs to make sure DJs, VJs, and Staff are in the instance before opening the gates to attendees. Something along the lines of a toggle or button in UI that the instance creator can toggle to change the visibility state. As we are now, as soon as the group instance is created, everyone can see it and that opens potential of people who need to be in losing their slot due to a crash or join error on initial join.