Between 1918 and 1921, The Society for Private Musical Performances existed in Vienna. Founded by Arnold Schönberg, it served as an avenue for new music to be presented to a curious audience.
Their three precepts are just as relevant if not more so today:
1. Clear, well-prepared performances
2. Frequent Repetitions
3. The performances must be withdrawn from the corrupting influence of publicity; that is, they must not be inspired by a spirit of competition, and must be independent of applause and expressions of disapproval.