European-style dogging in the U.S. is very, very rare.
Since the demise of Craig’s List, we’ve not organized a dogging session - however when it was viable, we did this about a half-dozen times. There are two very secluded, low-traffic parks relatively near by. We started a week ahead of the planned dogging encounter day, posting ads in Craig’s List MW for M or MW for MM sections to generate candidates.
The turn-out was mixed in every case - the most guys that ever showed were in the 8 - 10 range, not all at once which is kind of what we were hoping for.
The sessions were a combination of groping, oral sex, and on a couple of occasions, full-blown fucking. One of them ‘deteriorated’ into a bareback cum fest, because KK had been doing tequila shots before the encounter - she decided she needed cum in her pussy to be satisfied, and allowed herself to be bent over the trunk of the car and doggie-fucked by a half-dozen strange men.
We’ve traveled in Europe, where dogging is much more common, and can be done spontaneously if you know where to go. There are active sources of information about venues, timing, safety/security, and ‘quality’ of male admirers - that’s lacking entirely in the U.S.