Both parties have primaries in Michigan and Mississippi on Tuesday, and the Republicans also have a primary in Idaho and a caucus in Hawaii.
I’ll give the GOP details below. (From the Green Papers - click on the links for each state.) If someone wants to do the same for the Dems, go for it; I think we can share a thread.
So on the GOP side, Michigan has 59 delegates, Mississippi 40, Idaho 32, and Hawaii 19.
Michigan allocates its 59 delegates proportionately on a statewide basis, with a 15% cutoff, and a 50% winner-take-all threshold.
Mississippi allocates 28 of its delegates proportionately on a statewide basis with a 15% cutoff. (No WTA threshold.) The remaining 12 are allocated by Congressional district, 3 per CD, with 2 and 1 to the first- and second-place finishers in the CD, with a 50% WTA threshold in each CD.
Idaho allocates its 32 delegates proportionately on a statewide basis, with a 20% cutoff, and a 50% winner-take-all threshold.
Hawaii’s 19 delegates are allocated more or less proportionately with some fun n’ games in the rounding that I was too lazy to wade through. 10 delegates are allocated statewide, 3 for each of its two CDs, and 3 party officials will be delegates. Even though it’s a caucus, the vote is by secret ballot, and while it’s technically a closed caucus, anyone can register to vote and join the GOP on the spot, so the difference between this and an open caucus is pretty trivial.