A cropped print of this picture is labeled “Summer of 1953 or 1954 in Forest Grove with college friends before leaving for seminary in Boston” in Mom’s hand writing. Mom and Dad got married in 1954, and Dad spent the 1953-54 year in Dufur. There’s no ring on Mom’s left hand, so this might actually be 1954, before the wedding, or 1953, before Dad started his year in Dufur.
That’s Mom and Dad in the center, and evidently Wid Bleything’s shadow, taking the picture. Helen, to the left of Dad, was married to Wid, and went to Lewis and Clark with Mom. I’m guessing that’s Chet Cunningham on the right with the camera, and his wife Rosie. I have no other guesses!
Here’s the same group at the picnic table at Grandma and Grandpa’s house in Forest Grove, obviously the same day. Everyone’s still a bit more formal, ties and jackets still on.
These were both scanned from negatives.
A Family's Album 
Your mom and Wid go back to either First Grade or Kindergarten. His folks lived on 19th about three houses down , across the street. Also seems like your mom and Helen first met in high school.
Sent from my iPhone
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Some of those stories were shared here: https://familysalbum.wordpress.com/2013/01/12/and-away-we-go/