Century schedules?

[GLC1968]

http://www.bikeride.com/

Is pretty complete and has the whole country, I think some Canada, too.

Yep, most of the major rides in NC are not even listed. Here's a fairly comprehensive list for the whole state (it's missing a few BIG ones)

http://www.ncdot.org/transit/bicycle..._calendar.html

and then here is a pretty good 'high country' list.

http://blueridgebiking.tripod.com/id6.htm

[Trek420]

http://velogirls.com/resources/centuries.php