This question keeps popping up and so here's the answer again.
School Board elections in Seattle work in a very different way from other elections.
In the PRIMARY, only those voters who live in a district where a position is up for a vote, will see School Board candidates on their ballot. In this election, only voters who live in District 1, District 2, District 3 and District 6, will see candidates on their ballot. And, they will see only candidates from their district on the ballot.
Basically, you do NOT vote for School Board candidates in the primary UNLESS you are in a district where the position is up for a vote. That's why some people don't have any School Board candidates on their primary ballot.
When the primary has whittled the candidate pool down to two, then, in the General election, EVERYONE will vote for candidates in ALL 4 races. The SB elections are then a city-wide race.
(In the case of someone running unopposed in a district in a primary, that candidate goes to the General but has already won the race.)
This method makes running for School Board fairly tricky because you need a base in your district to get you out of the primary and then, after the primary, you have to flip to a city-wide campaign. It's a lot of work so thank you to all who have stepped up to run.
(In the past, some in Seattle have advocated for City Council seats to be by neighborhood or region and I suspect the same kind of voting set-up would take place.)