During the 1970s there were either four or five reunions.

1972
1974 Las Vegas
1975 Sacramento
1977 San Diego
1979 San Diego

Photos of some of these reunions can be found at either

Reunions Past

or

Previous CL-50 Gatherings

at the USS Helena Organization web site

You will find that the material within each page of
the 1970s reunions is not consistent.

Some will have either reunion announcements or photos
while others will have both along with articles from ALL HANDS magazine