Acquatennial ( It should be spelled Aquatennial.)  is listed in the NYTimes radio log in the Philip Marlowe time slot.

The local broadcast of the Minneapolis Aquatennial was scheduled for 6:30-7:00 p.m. (CST) 23 July 1949 and it was a delayed broadcast in NY pre-empting the Philip Marlowe show, 8:00 - 8:30 p.m. (EST).

In 1936, David Warren Onan was elected President of the Minneapolis Civic and Commerce Association, a forerunner of the Chamber of Commerce. This led him and a group of men to found a summer celebration which is known as the Minneapolis Aquatennial in 1939. He was very proud indeed when the D.W. Onan & Sons company float carried the Queen of the Lakes in 1949 

Clellan is the announcer on "Aquatennial Time", a special radio broadcast from 6:30-7:00 p.m. (local time) starring Bob Hope, Arthur Godfrey, and Cedric Adams. 

Bob Hope was a visiting celebrity during the 1949 Aquatennial in Minneapolis. 

1949 Queen of the Lakes Jean Johnson was sponsored by Dayton's Department Store. Queen Jean was featured in a Sunday Tribune article called "Paper Doll." It described how to dress like a queen for $134.25. Jean was pictured as a paper doll, complete with cut-out clothes to dress her.