I was at that Baltimore convention with Freddie. I was 16, and working in the "Public Address" (sound) department. During one of Freddie's talks the sound went out. The poor guy on the stage had every mic out there in front of Freddie, to no avail. The fellow working the sound mixer had accidentally kicked the power cord loose.
It was at that convention that Fred went on and on about 1975. I remember his words went something like this.... "we're not saying that Armageddon will come in 1975, but it would be fitting if that happend." Of course he was lilting on about the 6,000 years of man's creation ending then.
BTW I still have my collection of those same tracts still in the plastic folder we used to carry in our brief cases. I have one that is titled "Jehovah's Witnesses, Communists or Christians?"