They're up through May 11th according to /calendar in game. As for which eras it depends what server you're on. For standard non-TLP servers you'll have fabled for classic up through PoP. On Phinigel they're currently limited to classic through Velious. Ragefire/Lockjaw I'm not 100% certain what era they're on right now. On Coirnav/Agnarr there are no fabled this year. EDIT: to be clear I'm talking about fabled mobs, not zones. The zones never become 'fabled.' If you're talking about hardcore heritage zones that's a different thing.
yes From Apr 12, 2018 at 12:00 AM to May 10, 2018 at 11:59 PM Fabled Mobs for Newbies http://www.paullynch.org/eqguide/guides/fabled-mobs/ http://everquest.fanra.info/wiki/Anniversary http://everquest.allakhazam.com/db/quest.html?quest=6782