Remember the camaraderie of high school, when, for better or for worse, everybody knew everybody else? That’s how this market feels, like a comforting stroll through familiar corridors, with vendors who greet you — and each other — warmly. The market, run by SNA Estate Sales & Auctions, opens at 7 a.m. and by midmorning, the vendors have begun joining the customers, checking out competitors’ offerings through closing at 2 p.m. They greet one another like old friends, sharing gossip in the vintage world while casually eyeing wares and politely stepping aside when it looks like someone is going to make a sale. It costs $2 to enter this swap meet at the Ventura County Fairgrounds at 10 W. Harbor Blvd., Ventura, where you’ll find clean, ample restrooms and plenty of free parking. And since you’re shopping on a Wednesday morning, it has that nervous, thrilling feel of skipping school to go to the circus. There are vegetable stands at the entrance, along with a man who sells plants and fruit trees, and then the …