Before the annual Guam Liberation festivities was the Guam Agricultural and Industrial Fair that was first held in 1917 and was intially held during the 4th of July timeframe.
The third Guam Industrial Fair was held from July 3-5, 1919 at the Plaza de Espana. Josefina Pangelinan was crowned the Queen after receiving 135,304 votes while her closest competitor was Josefina Davis who trailed by 20,958 votes.
I found these photos that were provided from Marvin Ainsworth's Collection, courtesy of Guampedia.com:
Additional Sources:
Pacific Profile (December 1964)
Report of the Guam Agricultural Experiment Station 1919 (February 17, 1921)
