...
You can be in the hotel halls and lobby past 2am, in areas that are open to the public, subject to the hotel's policies and rules. But all Kumoricon event areas will be closed and locked.
To avoid future arguments and misunderstandings, Let me clarfiy further.
The parts of the map above and to the left of the Lanai Suites will be closed to attendees at 2am, they will be closed to minors are 12 midnight.
The parts of the map to the left of REG will be closed to attendees after 2am.
The second floor event hall will be closed to attendees after 2am.
The hotel has no official curfew by age, though it does have it's own rules regarding noise in the guest room hallways. This includes the 2nd floor, in the top part and off the map. Since it outside of conspace you can hang around in the main lobby, the pool, the hall near gaming, the hall leading from REG past the Rounds, and the area outside the hotel are free range. I don't advise hanging around in the parking garage itself but the sky walks connecting the hotel's 3rd and 2nd floors may be a good spot to get fresh air (remember you need a key card to get back in).
This does not include the park across the street, which is governed by Portland Parks and Recreation.
http://www.portlandonline.com/parks/finder/index.cfm?action=ViewPark&PropertyID=186&c=38308The park is open from 5am to midnight, so it will be closed by the time the convention closes.