Also, give us your suggestions for venues you think would be a good fit for CampPress.

Yeah, finding places for camping-like events is going to be much tougher than finding facilities to host a conventional conference.

The bigger your envisioned outdoor event, the bigger the challenge finding a place. In fact, the idea is unsuitable (and unwelcome) in typical 'campgrounds', with anything resembling the numbers of a Word-ference.

You have to 'take over' some place, completely. That's why Mendel Kurland refers to a "summer camp", meaning a property resembling a resort, which caters to single-party rentals. These are much less common (yet) than campgrounds, and they have their own sets of market/business expectations. (Such as, anything summer-camp-like will typically aim for longer occupancies, like a week minimum.)

Competition for such sites is normally fierce. Everyone wants them in the nicest season, and then they languish most of the year. The business-model is highly suspect.

It rains outside. Hello? In the roomy Great Basin, you risk mercury-busting temperatures. Bucolic childhood camping memories involve some fascinating selective recall.

This general camping-idea has some tantalizing attractions & potential ... but there are very real reasons we don't see it being exploited more commonly.
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Amateur Radio has long conducted events that bear a resemblance to what's on the table here (or in folks' sweet lil' imagination ;). Remember, Ham Radio is actually an Emergency Response or First Responder type of organization & portfolio. So a barren plot or field is acceptable, and they bring in all their support & logistics. They need not rely on - nay, actively avoid - developed venues.

Ham Fests are often not at venues that are intrinsically romantic, that are in fact simply vacant properties. Yet they can be a seriously rippin' social scene, with - notice - technically minded folks grappling together with shared challenges, in the face of unpredictable Nature.