I've read the following in a description of a workshop:
We have about 15 participants and seek an “Oberwolfach style” with a relatively low density of talks.
I couldn't find anything about this style in Internet. But I found out that there is The Mathematical Research Institute of Oberwolfach, and according to Wikipedia
It organizes weekly workshops on diverse topics where mathematicians and scientists from all over the world come to do collaborative research.
But the sense of this “Oberwolfach style” is still vague to me.