For your information should you need accomodation:

There are several hotels Along the Wisconsin Avenue corridor near the NIH campus. Note that while hotels located near the Bethesda Metro station are not as close to other hotels on Wisconsin Avenue, travel to NIH is often faster and more convenient due to the Metro. The Bethesda Metro station is one station south of the Medical Center (NIH) metro station.

Hotels between Medical Center (NIH) and Bethesda Metro Stations

American Inn of Bethesda

8130 Wisconsin Avenue
Bethesda, MD 20814
http://www.american-inn.com

DoubleTree Bethesda

8120 Wisconsin Avenue
Bethesda, MD 20814
http://doubletree3.hilton.com/en/hotels/maryland/doubletree-by-hilton-bethesda-washington-dc-WASBHDT/index.html

Bethesda Court Hotel

7740 Wisconsin Avenue
Bethesda, MD 20814
http://bethesdacourtwashdc.com

Hotels near the Bethesda Metro station (one station south of NIH)

Hyatt Regency Bethesda

1 Bethesda Metro Center
Bethesda, MD 20814
https://bethesda.regency.hyatt.com

Residence Inn Bethesda Downtown

7335 Wisconsin Avenue
Bethesda, MD 20814
http://residenceinnbethesda.com

Hilton Garden Inn Washington DC/Bethesda

7301 Waverly Street
Bethesda, MD 20814
http://hiltongardeninn3.hilton.com/en/hotels/maryland/hilton-garden-inn-washington-dc-bethesda-WASBTGI/index.html