Family Get-Together, 100 Plus Years Ago

Scrolling through photos, I spotted this scan of a photo I printed from the negative many years ago.  The license plate says 1914, and that probably is pretty close.  At the wheel is a great aunt, May Garrison, and in the passenger seat is her sister Iva.  Behind Iva is my Great-Grandmother Myrtle, who passed away in 1971.  I remember her very well. 

I know nothing about the car, but it is noteworthy that it has acetylene headlights.  I think manufacturers switched over to electric lights about 1915.  The right hand drive is dated.  Ford switched to the left side with the Model T for the 1909 model year. I wish I knew where this gathering occurred, and the people in the background.  They are probably family, but the details are a lost ball in high weeds.