Each module has a Course Room already created for it which is accessible at the top of your Sessions page within the Collaborate tool. A Course Room is always available and does not need to be scheduled. This can be useful as an area for students to meet informally to discuss. By default students can only use the chat functionality but you can change the settings to make any attendee a Presenter.
The options for the Course Room can be found by clicking on the three dots icon to the right of the screen. These are the same as for scheduled sessions but in addition you have the option to lock the Room if you wish students not to have access.