I can't comment on the camping parts, but assuming you're talking about the Oregon Convention Center, you shouldn't have any problems finding a place to park your bike. There are lots of bike racks near most of the entrances to the building.
The last time I went to Portland for a conference, I took a bike with me on the train. Sadly, there was so much rain that I didn't do much riding other than between the convention center and my hotel downtown. But even that little bit was fun.
2009 BMC Road Racer SL 01 / Specialized Ruby 155
2007 LeMond Reno / Luna Chix Team Saddle
1980-something Lotus Odyssey / Brooks Finesse
1992 Bridgestone RB-2 / Brooks B-17 Imperial
Nada Bike singlespeed / Brooks Team Pro in white