It does sound like female is the way for you to go, based on that previous time. Of course, he may just bark at puppy energy and sex will have nothing to do with it.
If puppy doesn't have all her shots already, I'd steer clear of grassy areas...they're more likely to have pathogens from passing wildlife/other dogs. Some place paved (and in the shade for tender paws). Both pups on leash....take someone else with you...so that they can be kept separate as needed (if puppy energy is part of the equation). If you drive to the rendezvous, have one or both in crates in your vehicle...or separate vehicles (see reference to "someone else").
That said, we have introduced both ways (in our yard with wonderfully mellow Brutus when we brought home wee Hershey) (on the sidewalk outside Brutus' previous home when we brought our Akita over to meet him) (at home of subsequent puppies with both Brutus and Kiku the Akita). All of those encounters involved Brutus...who wouldn't have barked at a puppy if his life had depended on it (after we had his 3-year-old self neutered, that is....we got him with horrible male dog aggression...revealed to us by a tiny male puppy in his owner's arms in the vet waiting room).
Good luck. Let us know how it goes and....you know the drill....pictures, please.