Being an ex-guide I just wanted to let you know the ONLY time items like this are handed out are at historical quests. Historical meaning a large scale event that adds to the Norrathian story. For example this ring was handed out at the Firionia Vie in Gfay/Lfay event that caused the Lfay corruption. That was a historic event as it not only altered a zone for a period of time but has a true storyline behind it and will be remembered forever.
A typical GM event is more like a simple quest ("I'll give you a prize if you answer this riddle") or taking a bunch of aviak characters and trying to ...err rid the Aviak Tree in SK of intruders. At events like that you can still get nice items...but they're all usually fairly common items worth maybe between 500-1kpp and can be gotten in the game without attending these events.
Keep your eyes out though...I don't know the schedule of when more historical events will be played out but with a new expansion coming you can bet there will be events bringing out the Luclin storyline...and to top it off historical events are done on EVERY server...but not necessarily at the same time...so what the EQ boards for reports of a historical event on a server and then watch for it on yours (usually they're all done within a few days on all the servers)....all the historical events are run the same to keep the same story line...there is a bit of improvisation and of course getting players involved but the general background remains the same.
There is my GM event vs Historical event 101 =)

