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.