Last one I attended was 1991. No I couldn't do it again.
However, as miserable as the 3 day conventions of my childhood were, they were nothing compared to the stories of the 1950s that my older relatives told me stories of.
Imagine driving almost 900 miles from Georgia to New York on pre-interstate highways. Sitting in the open air at Yankee Stadium in the middle of the summer from 9a.m until 9:30 in the evening. For EIGHT DAYS. Sleeping in a pop up camper. Waiting in lines to use makeshift shower and toilet facilities. The smell by day 8 must have been indescribable.
Also, what in the world did they manage to come up with to speak about to fill 12 hours a day for 8 days???
Then drive back home utterly miserable and exhausted. Today that drive is about 16 hours. Back then it must have been a multi day drive on state highways and secondary roads. Insanity.