(Did you mean the Worldcon or the Seattle convention?))

The Portland Science Fantasy Society sponsored a convention named Norwescon, AKA the Northwest Science-Fantasy Conference. It was held April 23, 1949 at organizer Donald Day's home and there were 24 members from all of the three Pacific Coast states. Forrest J Ackerman traveled the furthest, but G. M. Carr and son Eric came down from Seattle and a contingent (Rosco Wright, Norm Hartman and Dennis Fraser) from the newly-formed Eugene Science Fantasy Society. Mark Walstead came from Corvallis and the other attendees were Portland locals.

in All Our Yesterdays, Harry Warner reports that

John de Courcy introduced to the world his celebrated matter transmitter, and got a Venusian monster from it on the first test. After a buffet supper, a business session dealt with the formation of science fiction groups in Oregon and Washington. Forrest J Ackerman talked about the history of Amazing Stories. Day conducted an auction in which a Bok original brought $15 and less glamorous original artwork sold for 15ยข. Dancing and an unsuccessful attempt to transmit matter followed.

There is a longish convention report in Fantasy-Times #81, May 1949.