I agree, having 10 between the conventions and the election seems very tight. However, when McCain offered the format of 10 town hall debates, it happened in
early July, when the two candidates had secured enough delegates to carry their parties nomination. Therefore, the debates would he held during the summer leading up to the convention, instead of after the conventions.
And, as is says in the article above, only 1 other time has an agreement like what McCain was proposing ever happened. It was between Sen Barry Goldwater and President John F Kennedy in 1963. However, Kennedy was assassinated before the campaign began. However, in 1858, the famous Lincoln Douglas debates happened, where the two debated 7 times across America. But, those debates were unheard of in that time, and it shows, because the next Presidential debate was not until 1948.
I found a
list of all of the past Presidential debates. And, I did not know this, but I guess it makes sense, that before the broadcast era in 1960, there was really
no need or demand for Presidential debates. There were only 2 radio broadcast debates in 1948 and 1952, and the first televised debate did not happen until 1956. In 1960 Kennedy and Nixon had 4 televised debates, but the 16 years following did not have any. But in the last 32 years, the trend has been to have 2-4 debates between the Presidents.