From the airport to the hotel
ATMs are widespread and will accept most international bank and credit cards. Credit cards may be used at most hotels, restaurants, care hire companies etc.
The electricity supply is 120 volts. Power sockets in the US are of type A & B. http://www.usatourist.com/english/traveltips/electric-power-tips.html
You may need a converter to change the voltage from 120 volts to 220 volts.
Cellphone emergency number: 911
Emergency number for conference matters: 001-503 626 8197
Dress code for final dinner on 26 October
Business casual. You might even want to dress up a bit, however, there are no obligations.
Visa Requirements are done through the US. Department of State, see https://travel.state.gov/content/visas/en.html