The 2010 event is planned for
February 20 & 21
Saturday 10:00 a.m. to 7:00 p. m. and
Sunday 10:00 a.m to 6:00 p.m.
Lane Events Center at the Lane County Fairgrounds, Eugene, Oregon
From the official website I got by typing 'Eugene Asian Celebration' into Google.
I've meant to go the past few years, but never bothered. I think I might go on Saturday, dunno if I'm gonna go in cosplay though.