Grand Prix Washington DC
It seems that there has been a change to the Grand Prix schedule from Wizards. We're still trying to track down when the change happened, but what had been initially announced as "Grand Prix Baltimore" has been renamed to "Grand Prix Washington D.C."
This is likely due to a venue change, and with Wizards pushing Tournament Organizers to no longer mis-represent the locations of Grand Prixes, a rename had to occur.
The change doesn't affect anything really other than causing people to update calendars (such as our Premier Magic Event calendar.) The format and dates remained unchanged.
For those travelling to the United States from elsewhere in the world, it should be known that Washington state (where Wizards is headquartered) is different than Washington D.C., the latter being our nation's capital on the east coast of the country. From which Baltimore is only a few miles away from.