) "1935, the National Recreation Association's journal Recreation described what a Christmas in July was like at a girl's camp, writing that "all mystery and wonder surround this annual event" quote from Wikipedia about the first time the term Christmas in July was mentioned in print.
2) Irish tourists that started Yulefest. A yearly Christmas in Australia every year in July. The tradition is credited to a group of Irish tourists visiting Australia's Blue Mountains in July 1980.
3) Elvis
4) Ernie Tubb
5) Texas's (Where Tubb was from) Christmas Mountains. And Tennessee's (home of Elvis Presley) Blue Ridge Mountains.
6) Blue Christmas
7) Christmas in July.