The district training schedules can now be found on the “District Schedules” page located under the “Training” tab.
Practice Lab 2016 was released on 10 Nov 2016. As of the morning of 12 Nov, you could only create federal returns; the state modules were not available.
To access Practice Lab 2015, click on the Tax Year 2015 Returns button. You can then create new and see your existing 2015 federal and state returns.