I believe the event is given the name of the activity itself, and by default, the name "Attendance" is filled in automatically when you create a new Attendance activity. If you change it to e.g. "Company Law", then when sessions are created, they will use that name instead. Unfortunately, calling the attendance activity by the course name is not very useful. You could consider giving the new activity the course name first, then creating all the sessions so that the events have a sensible name, and then renaming the activity to "Attendance".
Attendance (plugin)
Change Calendar Event Title
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