March 2024 (presumably): Hawaii County Conventions.

... Hawaii Republican Party members who are registered to vote in Hawaii are eligible to vote. Voters may sign a Hawaii Republican Party card to join the Republican Party at the Caucus site on Caucus day ... Hawaii Residents may register to vote ... at the Caucus site on Caucus day .... [Rules of the Hawaii Republican Party. Section 215.C.]

Tuesday 12 March 2024 (presumably): Hawaii Precinct Caucuses. Hours reportedly 6:00p-8:00p HAST (0400-0600 UTC). Delegate Binding: Proportional Caucus/Convention. Voter Eligibility: Closed Caucus/Convention.

Precinct Caucuses (preliminary)
Included in Nationwide vote.

All 19 of Hawaii's delegates to the Republican National Convention are pledged proportionally to presidential contenders in today's Precinct Caucuses. [Rules of the Hawaii Republican Party. Section 214.]

• Each Presidential campaign (or uncommitted slate) supplies a list of delegates to the National Convention. 20% of each slate (delegates and alternates) must come from a county with a population below 500,000. The State Chair and National Committee members cannot be part of a slate. [Rule 215. E.]
• Voting is by secret ballot. Ballots are cast for the slate rather than for individual delegates. The names of the National Convention delegates will not appear on the ballot.
• Voters may join the Republican party and register to vote at the caucus. Only party members are eligible to participate in the caucuses.
• Blank votes, spoiled ballots, over votes, and write-in votes for a candidate who is not registered with the FEC as a Republican candidate for President are not considered to be valid.
• Allocate the National Convention Delegates:
1. Starting with the highest vote getter, compute the Delegate Allocation Percentage-- the candidate's votes divided by the total number of votes (in that jurisdiction) and round the percentage up to the next whole number. Then, multiply the number of delegates (in that jurisdiction) by the Delegate Allocation Percentage and round up to the next whole number. Continue with the next highest vote getter until all delegates are pledged to a presidential contender. The number of delegates allocated to each jurisdiction is:
• CD 1: 3 delegates.
• CD 2: 3 delegates.
• Statewide: 10 delegates (10 base at-large delegates plus 0 bonus delegates).
• RNC: 3 delegates.
• The Hawaii Leadership Committee of each Presidential campaign appoints Party members to fill the delegate positions. [Rule 215. E.]

In addition, 3 party leaders, the National Committeeman, the National Committeewoman, and the chairman of the Hawaii's Republican Party, will attend the convention as pledged delegates by virtue of their position. [Section 216.]

Precinct Caucus (preliminary)

Rules of the Republican Party of Hawaii:

• Section 214. ELECTION. ... Hawaii Republican caucuses shall be held on the second Tuesday in March of each Presidential Election Year. ...
• Section 216. CANDIDATE COMMITMENTS. Except by their own commitments, National Delegates ... shall not be required to support any particular candidate for the Republican nomination for President or Vice President. Provided the candidate the delegate ... is supporting has not withdrawn prior to the first ballot at the National Convention, the commitment to that candidate shall be binding, but only through the first ballot.

Saturday 18 May 2024 (presumably): Hawaii State Convention.