A candidate for Delegate or Alternate Delegate must be a registered Republican in the District of Columbia since at least 2 June 2018 (two years prior to the primary).

Tuesday 2 June 2020 (presumably): District of Columbia Primary. Hours reportedly 7:00a-8:00p EDT (1100-0000 UTC). Delegate Selection: Winner-Take-All Primary. Voter Eligibility: Closed Primary.

Primary
Source: DC Board of Elections.
Status: Official. Retrieved: Thursday 18 June 2020.
Included in Nationwide vote.

All of 19 of the District of Columbia's National Convention delegates are pledged to presidential contenders based on voting in today's District of Columbia Presidential Primary. [Republican Presidential Convention and Delegate Selection Plan Section II. 1]

National Convention Delegates run as slates on the Citywide ballot. The candidate who receives the most votes receives all of the District's 19 delegates.

If a Presidential candidate who is allocated delegates withdraws prior to the National Convention, the delegates bound to that Candidate become unbound. [Section V. 7.]. If only one candidate's name is placed in nomination ... all delegates shall be bound to vote for such candidate on the first ballot provided that the candidate received votes in the DC presidential preference poll [Section V. 8.]. The DC Delegation ... shall be bound through the first ballot .... [Section V. 9.]

The 3 party leaders, the National Committeeman, the National Committeewoman, and the chairman of the CD Republican Party, will by virtue of their position, attend the Republican National Convention bound to the candidate of their choice. [Section V. 6.]