Several times! In the bushes outside the front door to a somewhat "speak easy" type of bar, had to go in through the back of a restaurant and up the stairs. Parking lot light illuminated us but the bushes concealed us, only slightly. I think people walking in and out of the door were just about 15' away from us, I was standing against the wall she was squatting. I didn't cum, but almost, she just wanted to try. Anyone looking into the bushes could've seen us, they were pretty sparse!
Parking garage late one night just by my car, lights were pretty bright, I don't know what came over her, she just went for it. There were cameras for sure, but it was like 1999 or 2000 so maybe not? Didn't cum but she gave me head for a good couple minutes, long enough for someone to have come by.
At a park in an outdoor exhibit, anyone could've come down the stairs at any time. I almost came but we thought we heard someone coming so we quit fast. Went up and looked around and no one was there. Damn! Didn't get back into it, it was at least an almost 10 minute BJ and we took it and left.
Surely there were a few parks and public gardens where she blew me, I can't remember the details, but we'd just be walking down a trail and she would pay attention to who was ahead or behind us and when the coast was clear, she'd stop me, pull it out, and go at it. Once she made me cum and just as I was putting my cock back in my pants and zipping up, and she was getting up and wiping her lip off, a couple rounded the corner around a tree we were "hiding" behind and they stopped almost startled and we looked super guilty and blushed, and they seemed prudish enough that they didn't suspect anything, but the guy looked back as they passed about 20 feet later and gave us a "huhhh???" puzzled look. We left and laughed so hard!
My wife gave me head in the car along many busy roads with lots of stoplights, some people were right next to the car and she didn't care, she loves it!
Not sure if tents count, but at Bonnaroo she sucked me pretty loud and we fucked also very loudly and people were just outside our tent hanging out talking. I mean it was splacking loud, we were sweaty as fuck and it was whap, whap, slap slap slap wet ass sex. We came hard and tried to stay quiet but we're sure people heard us cuz later when we got out one of the dudes gave me a wink and a girl near by a thumbs up. LOL!! (Not a blowjob but related: Also in a tent at a state park, we thought we'd be very alone but were next to an access road. People were walking by with flashlights and talking while my wife rode me and milked my cock into her pussy with a very loud "fuuuuuuuck yahhhhhh" and I couldn't stay quiet either. The couple people obviously stopped walking and stopped talking, then after a few seconds carried on at which point my wife giggled.)