In the current release of Face-to-face (tested in Moodle 3.3 and 3.4) when configuring an instance you have the choice to set the Calendar display settings to Site, Course, or None. In earlier versions of Face-to-face Site added it as a global event and course as course event and none didn't add it to the calendar at all.
In the current version both Site and Course options appear to add it a course event, so you can't add a face-to-face session to the calendar as a global event at all. This requires users to be enrolled in the course to ever see the session.
In earlier versions you could use Face-to-face as a way to advertise courses via the calendar and drive enrollments.
Anyone else seeing this? If so, have you found a solution?