It is not a guild, but if you are interested in networking with other people and learning about RP events specifically meant to add to Thalassian culture & Quel’Thalas, come check out the Ashen Court Discord!
Obvious ones to mention are Silvermoon Sundays (a specific day for walk up in SMC), a Thalassian food cart twice a month, and seasonal cultural holiday observation events. We’ve also had people post when they have shops open in Silvermoon ICly, plan major social events (such as noble balls/gatherings), and host Ranger Games.