To vote in a primary election in the District of Columbia, you must be registered to vote with one of the parties that is eligible to conduct a primary election (Democratic, Republican, or D.C. Statehood Green). You must be registered with one of these parties on or before 5/14/24 (the 21st day before the primary election), unless you are registering for the first time when you vote.  In that case, you may register with a party when you vote.