Work on the relationship level pays off for success on the factual level. It therefore makes sense to take time to get to know each other during courses.
You should not shy away from a personal round of introductions, even in larger groups, or at least those that are still manageable.
A short round of introductions with names, perhaps origin and other simple questions is recommended at the kick-off event. Name cards for the first course(s) help to memorise the names and then allow all students to be addressed personally.
Introducing and getting to know each other contributes to a pleasant working atmosphere.