Ballotpedia has this useful compendium of restrictions on initiative circulators.
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On May 22, a 3-judge U.S. District Court heard the Alabama redistricting case for U.S. House. See this story. Allen v Milligan, n.d., 2:21cv-1530. According to the story, the state says if it loses, he will go to the U.S. Supreme Court.
UPDATE: see this story.
On May 22, Chris Getty, an independent candidate for U.S. House in Illinois, submitted almost 20,000 signatures to meet a requirement of 10,816. See this story. He is running in the 4th district, where the incumbent Democrat did not run for re-election, but he didn’t tell anyone he wasn’t running for re-election except that he tipped off his campaign manager. So she submitted a primary petition and became the Democratic nominee by default. If other Democrats had known the incumbent wasn’t running for re-election, there would have been many Democrats running for the seat.
Getty is personally a Democrat, but Illinois does not have registration by party.
On May 22, the California Secretary of State posted a list of declared write-in candidates for the June 2 primary. See it here.
There are eight Assembly districts in which only one person qualified to be on the primary ballot. Among them, no one filed as a write-in in the 4th, 8th, 22nd 0r 32nd districts. If anyone had filed as a write-in in any of those districts, and then received at least one write-in, that person would have been on the general election ballot.
In the 17th district in San Francisco, three write-ins filed, a Republican, a Libertarian, and a Peace & Freedom Party member. Whichever of these three gets the most write-ins will be on the November ballot.
In the 63rd district, a Peace & Freedom member is the only write-in, and he will be on the November ballot assuming he gets at least one write-in.
In the 54th and 61st districts, a Republican filed as a write-in.
On May 5, Ohio held its primaries. In Lucas County, six candidates polled enough write-ins to be deemed nominated, including one Libertarian. See this story.