If your instructors want to restrict activities / resources / sections in their course to users that have already booked or signed up for a specific Face-to-face session this plugin enables that. Once a Face-to-face activity has been added to a course and sessions have been configured you'll be able to select those sessions when restricting access to other activities or resources in the course. 

This does depend upon Face-to-face being installed and enabled on your site. Currently tested against the 4.1 branch of the plugin.