Apologies if there is already something on CC
Quoting the Groundspeak Weekly Newsletter:
"A Giga-Event is the newest geocache type. Attended by 5,000 or more geocachers, it’s like a Mega-Event of mega proportions. The geocache type shows a new level of appreciation to events that engage, entertain and inform geocachers on a massive scale.
While we know that the metric system prefix giga stands for 1,000,000,000, the name arose from inside the geocaching community and it stuck. So we co-opted the term to stay in line with our current system of events and Mega-Events. And of course, the name Five-Thousand-Event didn’t have the same ring to it."
Funnily enough, think we ran a poll about this last year... Did we think, back then, it was a good idea? A resounding no.
But do we now?
Personally, I think it's not a good idea - I don't think UK mega attendance has even broke 2,000 yet