In 2016 I wrote an article called The Sacred and the Profane, describing the two forms of Gnaoua music ( see http://sannyassa.co.uk/sacred-profane-gnaoua-world-music-festival-essaouira-2016/ ).
In that article I identified the paradox that lay ahead for the Gnaouia; to survive it had to become more popular, but by becoming popular it denied its sacred form and would slowly kill itself. Today, profane ( or popular ) Gnaoua can be heard throughout Essaouira. I was told that there are now 1000 malleem musicians in the city and private Gnaoua parties are common.
Correspondingly, the sacred form of Gnaoua is now rare. When held, it is mostly found in zaouias, for example that of Sidna Bilal, in Essaouira, or the zaouia of another brotherhood, such as the Hamadcha. It is mostly private and deals exclusively with the interaction between maleem and the jnoun. Of the 1000 malleem reputedly in Essaouira, I have also been told there are less than 10 who are sufficiently skilled or capable of conducting a truly sacred ritual.