Found photograph of a group of 12 men and women seated at a long bench under some trees while a man at a table in the background appears to be a bartender. If so, that would help date the photo to after 1933 when Prohibition ended in the United States. Maybe that's what they're celebrating! There is a big tent in the background. The style of clothing is consistent with the 1930s, possibly earlier. The location may be Eagle Lake, Texas as that is where the photo was found. Wherever it is, the photo presents an interesting country party scene from nearly 100 years ago. 

A bit of curling. Backside of the photo has a pencil mark. Measures about 3 1/2 by almost 6 inches.