Yes you can make a panel 18+ by having it after midnight because we go by the city of Portland's curfew. But it'd have to be only 18+, it'd just be a lot of work for staff to set a custom age limit (because they'd have to check ID, with 18+ you can just check badges)
Also, Nikki, I moved my Sakura-con room to the Hilton b/c way cheaper so hopefully we won't be too far apart floor wise!