Saturday 12 March 2016: District of Columbia Convention. Hours 10:00a-4:00p EST (1500-2100 UTC). Delegate Selection: Winner-Take-Most Caucus/Convention. Voter Eligibility: Closed Caucus/Convention.

Convention
Source: DC Republican Party.
Status: Official. Retrieved: Sunday 13 March 2016.
Included in Nationwide vote.

Saturday 12 March 2016: 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 Convention. [Republican Presidential Convention and Delegate Selection Plan Section II. 1]

• If a candidate receives in excess of 50% of the district-wide vote, that candidate receives 19 at-large delegates [Section V. 3.].
• Otherwise, the 19 at-large National Convention delegates are to be proportionally bound to those presidential contenders receiving 15% or more of the district-wide vote. If no candidate reaches 15%, the threshold is lowered to 10%. If no candidate reaches 10%, the threshold is lowered to 8% [RRP Rule 16(C)(2) and (3). Section V. 2.].
• There are two sections with different rules. Section V.4:
  The votes received by each Presidential Candidate who receives in excess of the threshold, without rounding, shall be divided by the total number of valid votes cast for all Presidential Candidates receiving in excess of the threshold. Starting with the candidate receiving the highest number of districtwide votes the percentage shall be multiplied by the total number of delegates rounding up to the next whole number to produce the delegate allotment for each candidate. Repeat this allocation process with each of the remaining Presidential Candidates in descending order of their districtwide totals until all available delegates are allotted. [Section V. 4.]
  The other section is Section V.5. This is the one we are using.
  The proportional delegate allocation shall be rounded to the nearest whole delegate. In the event that a delegate is unallocated due to mathematical rounding, the unallocated delegate vote shall be cast in favor of the candidate closest to the rounding threshold. In the event that delegates are over-allocated due to mathematical rounding, the over-allocated delegate shall be removed from the candidate furthest from the rounding threshold. [Section V. 5.]

Convention
Source: DC Republican Party.
Status: Official. Retrieved: Sunday 13 March 2016.

District-wide
Rubio: 19 delegates × 1,059 ÷ 2,068 = 9.730 delegates. Round to 10. Difference: -0.270.
Kasich: 19 delegates × 1,009 ÷ 2,068 = 9.270 delegates. Round to 9. Difference: 0.270.

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.]

The following 16 Delegates and 16 Alternate Delegates will represent the District of Columbia at the Republican National Convention from July 18-21 in Cleveland, Ohio: 1. Rich Counts, 2. Rina Shah Bharara, 3. Chip Nottingham, 4. Kris Hammond, 5. William Behrens, 6. Holly Greaves, 7. Robert Chamberlin, 8. Betsy Wright Hawkings, 9. Rachel Hoff, 10. Maureen Blum, 11. Brian Walsh, 12. Teri Galvez, 13. Robert Sinners, 14. Christian Berle, 15. Kevin Cain, 16. Tim Costa, 17. Peter Lee, 18. Jim Conzelman, 19. Laurent Crenshaw, 20. Joanne Young, 21. Patrick Shaughness, 22. Nicole Mortier, 23. Jim Dornan, 24. Jennifer Higgins, 25. Paul Vinovich, 26. Jeffrey Bobeck, 27. Justin Dillon, 28. Jeffrey Shapiro, 29. Dana Hudson, 30. Mike Wakefield, 31. Jonathan Slemrod, 32. Gary Teal

1 May 2013: Legislation B20-0265, introduced by P. Mendelson, Evans, Wells, McDuffie, and Bonds would move the District's primaries from the 1st Tuesday in April to the 2nd Tuesday in June.
2 December 2014: The Council of the District of Columbia votes 10-3 in favor of B20-0265.
6 February 2015: Signed by Mayor Muriel Bowser.
Act Number: A20-0620.
2 May 2015: Congressional approval. Law Number L20-0273.

The 2nd Tuesday in June is too late a date to begin the delegate selection process. The DC Republicans are likely to caucus in the 2nd half of March 2016.