Chthonia has been listed on the Divine Feminine App for a couple of years, and is now an affiliate of the site. The website and app are a great resource for everything related to the Divine Feminine, including the Dark Feminine. You can find sacred circles, events, and classes both in-person and online, and a resource list including books, blogs, and other media.
There are a few issues with downloading the app on some phones; these should be fixed within the next 1-2 weeks (from the date of this post). You can still register, which is free, and you will get an emailed list of events, and can also access events and resources on the website.