On April 27, New York cancelled its Democratic presidential primary, even though it was set for June 23 and the state will hold primaries for office other than president that day.

There wasn’t going to be a presidential primary for any other parties in New York, because presidential primaries in New York aren’t held unless at least two candidates appear on the ballot.  Although presidential candidates other than President Trump had petitioned for the Republican primary, the other Republican candidates had been disqualified because they didn’t submit delegate candidates in every U.S. House district.  The Libertarian Party had wanted its own presidential primary, but none of the candidates who petitioned also presented slates of delegates in all districts.  See this story.  Thanks to Joe Burns for this news.