Weather and Dress
The Washington DC area is a great place to visit in the late fall with day-time temperatures in the 40's and 50's. The December climate is quite variable, though, so be prepared for snow should that occur.
Check weather conditions a day or two before you depart to help you pack for the meeting.
For receptions and each day's programming, business attire is the norm. Remember, meeting room temperatures and personal comfort zones vary widely. We recommended that you bring a sweater or jacket to the sessions.