Canada held general elections for Parliament in 2021 and also 2019. There have been no general parliamentary elections since then. In both 2019 and 2021, the leaders of five parties participated in debates. See this wikipedia story.
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On June 7, 2024, the leaders of seven British political parties debated each other. See this story.
Britain votes on July 4, and there have been many debates this month. Some of them include only the leaders of the two biggest parties, Conservative and Labour.
In the 1980 presidential election, independent candidate John B. Anderson, who got on the ballot in all 51 ballots, had only been certified for the ballot in four states as of July 1, 1980. This information is from an AP story, dated July 1, located by historian Darcy Richardson. The states were New Jersey, Utah, Kansas, and North Carolina. Furthermore, after he was certified in North Carolina, the Democratic Party sued to remove him, and although Anderson won that lawsuit, as of July 1 he was therefore not absolutely on the ballot in North Carolina either.
On September 9, 1980, the League of Women Voters, which was sponsoring the general election debates, invited him into the September 21 debate, because he met their polling requirement of 15%. The League also required him to be on the ballot in states containing a majority of electoral votes, but the League accepted states in which the petition had been submitted; it did not insist on waiting for certification.
The June 27 presidential debate sponsored by CNN requires candidates running outside the major parties to have qualified in states containing at least 270 electoral votes by June 20. This is an irrational requirement, because the traditional bulk of petitioning for independent presidential candidates is done later in the year than June 20.
For example, in 1992, Ross Perot was only on the ballot in states containing 119 electoral votes as of June 15. The authority for this statement is the June 15, 1992 print issue of Ballot Access News. It shows he was only on the ballot in Alaska, Arkansas, Delaware, Florida, Idaho, Kentucky, Maine, New Jersey, Tennessee, Texas, Utah, and Wyoming (12 states). He was finished petitioning in many more states on that date, but the state elections offices hadn’t checked his signatures yet.
On June 17, the Missouri Republican Party filed a notice of appeal in Missouri Republican Party v Secretary of State. This is the lawsuit over whether the party has a freedom of association right to exclude Darrell McClanahan from its primary ballot. He is an “honorary member” of the Ku Klux Klan. He is running for Governor.
The party had lost in trial court on May 17. It is odd that the party took so long to appeal. The primary is August 7.