The first thing that I found was that Connellsville is in Fayette County (not Westmoreland) so I sent away for a copy of their marriage license. I received a letter back from the County Courthouse that there was no marriage certificate on file for Cubbage and Speck. I then sent a letter to the Wesley Methodist Church in Connellsville. I received a letter from the church that said that Rev Elliot was the pastor from 1935 to 1939, and that although they have a membership book with a section on marriages, there is nothing documented during the years of 1929 through 1944. So there is no official record of their marriage ... just the announcement in the paper.
There are some things that we know and a few other things that I did find. Both of Arthur's parents died less than a year before his marriage to Agnes (Maine died in August of 1938 and Charles died in April of 1939). I did find this in Maine's obituary: "Funeral services ... with Rev. L.S. Elliott, of Connellsville, former pastor of the local Methodist Episcopal church officiating." This is the same pastor that married Arthur and Agnes the following year, which may explain why they went to Connellsville. The last newspaper article that I found was in the May 29, 1939 Uniontown Herald in the Perryopolis section: "Mr. and Mrs. Frank Speck and son Frank, Jr, and Miss Marian Cubbage, all of Monessen spent Friday evening with Miss Ada Buttermore." Perryopolis is about 14 miles from Connellsville and Friday night was the night of the wedding and they were in the annoucement as being in the wedding party. So here is a picture of Art & Agnes on Easter in 1938 ... the closest we have to their wedding date.