Surminare only has true conclaves of followers in Selkie settlements, usually in hidden grottos, and generally speaking her followers will have special tokens of pearls as their paraphernalia.
sur-min-AIR
The goddess and creator of Selkies and lover of pearls, their worship is quiet and often hidden much like the Selkie settlements themselves. Outsiders are welcome, if they can find them, but are rarely given directions to one without being a friend of the clan. She is involved in the Asathalfinare, but is generally considered a minor member. She can be a fierce and skilled hunter, and sometimes joins Dionadier in a chase of interesting quarry. She is curious and seeks new things to amuse herself with. And of all the things she loves the most in the ocean beyond her Selkies, it is pearls.
Details borrowed from: https://forgottenrealms.fandom.com/wiki/Surminare