People who live here expect August in the Washington, D.C. area to be hot, humid, and horrible. It often is. Daily high temperatures above 90°F are common, relative humidity above 90% is also common. Nightly lows above 80°F are not uncommon. However, on average you should expect high temperatures in the 80s and lows in the 70s with a slight breeze. In other words, hot but far less horrible than the folklore would have you believe.
Washington sometimes has dramatic thunder storms in August, and a hurricane is possible (although unlikely). For more details, see What is Washington, D.C.’s weather like in August?
While it will probably be hot outdoors it may be chilly indoors. Air conditioning is used both to cool and to dry the air. This means that it is sometimes too chilly indoors for people dressed for the outdoors. Bring a light sweater or jacket; you may want it.
Places to eat
There are quite a few restaurants within walking distance of the conference hotel. Here is list of restaurant recommendations on the hotel web site.
The center of Bethesda is 3 Metro* stops south of the hotel. The hotel is a few steps from the "White Flint" Metro* stop. Bethesda is at the "Bethesda" Metro* stop. Bethesda is a vibrant area with hundreds of restaurants and bars. For more information see Bethesda Row and Downtown Bethesda.
Rockville Town Square is 2 stops north of the conference hotel on the Metro*. Rockville Town Square is a little less expensive than Bethesda and a bit more relaxed. The merchant's page lists about 25 restaurants, all within a couple of blocks of the Metro. Local favorites include: Giuseppi's Pizza, Lebanese Taverna, and Gordon Biersch Brewery Restaurant.
Things to do in Washington
Start with an overview at washington.org
Getting Around in Washington
Do what the locals do: Take the Metro!* The hotel is at the White Flint stop of the Red Line. (The hotel doors are closer to the entrance to the Metro* than the Metro parking lot is.) BUT, be aware that throughout 2016 parts of the Metro* system will be disrupted!