Jonathan Bernstein of Bloomberg View here suggests the possibility that there will be no presidential debates this year.
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Kansas held its primary on August 2. Incumbent member of the U.S. House Tim Huelskamp was defeated for the Republican nomination. This is only the fourth time this year that an incumbent member of Congress has been defeated in a major party primary. See this story. The other instances this year have been Republicans in North Carolina and Virginia, and a Democrat in Pennsylvania.
August 2 is the South Dakota deadline for independent presidential candidates. Two petitions have been submitted and are being checked: Rocky De La Fuente, and Chris Keniston (who is the Veterans Party presidential nominee).
The qualified parties in South Dakota are Constitution, Democratic, Libertarian, and Republican.
August 1 is the Massachusetts deadline for petitions for independent candidates for statewide office and U.S. House, and also for the nominees of unqualified parties for those offices. It is too early to know whether any petitions have enough valid signatures. Presidential candidates who took out papers are: Gary Johnson, Rocky De La Fuente, and William Feegbeh. According to information on the internet, Feegbeh was born in Liberia.
August 1 is the deadline for independent candidate petitions in Maine (for president) and Maryland (for all office). No presidential petitions were filed in either state.
The qualified parties in Maine and Maryland are Democratic, Green, Libertarian, and Republican.