I should add that most of the events mentioned here are smaller compared to some of the large English festivals and usually have quite a lot of informal activity going on too aside fron the official concerts.

Most of the concerts are held in local venues, e.g. function suites, village halls, clubs etc as opposed to large tented venues although there are one or two exceptions. However, it's not a case of buying a ticket and being "enclosed".
Some do have small camp sites or parking for motor homes. Again, this is usually fairly informal.

There are also larger festivals in Scotland, e.g. Heb Celt, Belladrum, Speyfest, and so on which are different in nature. They are good in their own right, of course, but maybe not so many of the regulars here attend these.