Here's the back of the card, which Mike sent to Mrs. Oscar Bentson in Florence, Montana.
The message reads:
Dear Pat -
Your postal was O.K. looks good to see the st cars. How do these berrys look to you? Ma and I have just arrived from Portland, we were down to the carnival. Had dandy time - Took in everything Will write later + tell more about our trip.
Based on the June postmark, it's likely that Mike was in Portland for the Annual Rose Festival. The Rose Festival was a fairly new event at the time, but it is now an important tradition in Portland.