The U.C. Berkeley Washington Program's Fall 2018 Semester begins on August 27, 2018 (arrive the 25th or 26th) and ends on December 7, 2018.  Here's the Academic Calendar (Scroll down to Academic Year 2018-2019 Calendar link):

We are additionally providing copies of materials that are a critical part of your orientation process. The Fall 2018 Student Guide contains information on our program and the Washington Center. Please be sure you review it carefully as part of the orientation process. The Fall 2018 Residential Brochure is designed to give you the latest information regarding your stay in Washington. You will also be required to sign a housing contract. Please make sure that you, and any others you wish to review it, read it carefully before signing. Please bring the major advising planning form to your meeting with Marcia Condon.

Check out the Intern's Guide to Washington D.C. Updated. It's packed with handy tips about life in the nation's capital!

You may be able to save money booking your flight through Connexxus, using a UC partnership with Shorts Travel:

The following Pinterest page has great information about free things to do in D.C., dressing for internships, and other helpful tips: