The first photo has a notation that it was taken at the 1964 ANA convention in Cleveland. Everyone's wearing a convention badge and posing for some award. Zooming in, I think I can read the words "Fifty Years". Larry Dziubek recognized John Knabenschuh, who was a WPNS member and Past President. Neither of us recognized the fourth man. However, finding the answer was a lot easier using the new Numismatist online archive. Here's what I found in the November 1964 issue (p1489):

The second photo was taken at the same event as the third photo, where we can see that it is marked DEC 66, meaning the film was developed in December 1966, so it could have been taken that month or earlier. That's late for an ANA convention photo. WPNS member Bill Hunter is in the third photo, so my guess is that this was taken at a WPNS Banquet where Eric Newman was the speaker. Larry believes the second gentleman may be WPNS member Chuck Erb - I knew Chuck as well, but neither of us are sure.

Any help confirming the tentative attributions would be appreciated. Thanks.