This is my new favorite spot on the web: the Alliance of Literary Societies, a union of more than 100 societies dedicated to the cooperative promotion and preservation of literary heritage. "Literary societies have successfully campaigned for postage stamps to commemorate their authors, encouraged publishers to reprint their works and persuaded local authorities to put plaques on buildings" (Linda Hart, "Literary Societies."Women's World, 2003).
The Alliance's unassuming website is a touchstone for links to literary society websites, their newsletters, publications, and conferences.
For example, there are societies for John Betjeman, Rupert Brook, Thomas Hardy (of course), Walter de la Mare, Siegfried Sassoon, and even a Friends of the Dymock Poets society.
Members in the Alliance receive a newsletter and the annual journal, assistance with grants, as well as a handbook which contains a directory of member societies, a calendar of literary events, a model constitution, as well as advice on copyright, public liability insurance, and data protection. For more information, see the excellent Women's World article, reprinted at the link above, or go to the details page for the Alliance.