WordCamp is a conference that focuses on everything WordPress.
WordCamps are informal, community-organized events that are put together by WordPress users like you. Everyone from casual users to core developers participate, share ideas, and get to know each other.
The best way to find out when the next meeting is to check the schedule, however, at the time of this posting, the next one is on March 4th, 2017 in Lancaster, PA, about 2 hours driving time from DC.
WordCamp Lancaster 2017 will be held on Saturday, March 4th at the IU13 Conference & Training Center in Lancaster County, Pennsylvania.