Must be pretty warm, look at the guy on the left with the towel draped over his head!
The car has circular vents on the face of the cowl. I'll bet those leaked water quite a bit.
The guy with the towel on his head had lent his straw Boater to one of his friends who went to Times Square to listen the Dempsey fight
England during WWI? Looks like the headlights have blackout shields on them.