Wikipedia
Elfcon
Elfcon (also ELFcon), short for " Elvish Linguistic Fellowship Convention", is a convention first proposed by Jorge Quiñónez, and then organized and originally hosted by Bill Welden, dedicated to the study of the languages created by J. R. R. Tolkien.
"Elfconners" is a loose term to refer to any attendee of an Elfcon, but the term is by some narrowed in use to refer to a specific group of people involved with unpublished linguistic writings by Tolkien.