Only time I did group lessons was once at a community college, don't waste your time or money. Pace is slow and the class moves at the speed of the least talented ones. Individual instructions from your own instructor cost less or just about the same.
And then a week long class at the John C. Campbell Folk School in Brasstown, NC. Great experience. Morning spent on lecture, afternoons with individual one on one sessions with an instructor then time with small groups and after dinner jamming sessions till all wee hours. Not bass, this was back in my claw-hammer banjo days. Cost - over $1,000 plus travel expense. You pay for what you get. https://www.folkschool.org/
Difference between the two - individual instruction and the jamming at night after class - we were all living at the school.