The Edinburgh Art Festival, nominally running from July 25 to August 25, 2019, corrals special visual-arts (mostly) exhibitions taking place in many of the city's galleries, both public and private. The website now has information about the topics of those exhibitions, their hours and their entry fees (though some are free). I see that some of the exhibitions begin considerably earlier in the summer.
For those interested in visual art, the festival website is a convenient source of information on special exhibitions taking place in Edinburgh--much easier that going to each individual gallery's website.