An article over at EverQuest II Players heralds the celebration with memories from both a former and a current Guide Liaison, as well as a story by well-known Elder Guide Ozymandias honoring all the folks who have served the community over the years. The story is written like an historical lore entry. It contains a few references to legendary names that should be familiar to EverQuest veterans.
Volunteer guides are a very old tradition in MMOs. Of course there were the Wizards of the MUD era. But after that, both Meridian 59 and Ultima Online made use of volunteer customer service and event folks too.