Crowds gathered as early as 2 a.m. this morning, although doors don't open until 9:45 a.m. Sanders will speak at 12:45 p.m.
Expect delays during the morning commute.
Parking will be available for $10, but venue officials said parking will be limited and attendees are asked to find another mode of transportation.
The Portland Bureau of Transportation said drivers should avoid the Rose Quarter and reminded attendees that the Broadway Bridge is closed to motor vehicles. TriMet is warning riders to expect delays and crowded buses and trains in the Rose Quarter area from 7 a.m. to 3 p.m.
(READ MORE: KGW)