They meet outside near the Plaza Hotel, at the southeast corner of Central Park, where the horse carriages, tourists and the food carts gather.
Horses can sense Fey Folk. The Veil does not fool them. Fortunately, they have no way of communicating this to the carriage drivers tending them.
Sylphs are one of those beings that can almost, almost pass themselves off as Human even without the magic of the Veil. She might, to an ordinary Human's eyes, appear to be a little too thin, too delicate... but most would guess she's sick, perhaps. Or maybe a model. They might question some other odd things, but with a quick encounter, most would never think anything but "Human". Long hair, pale skin, and quick and graceful mannerisms, but Human. Unless they realized she weighed less than a third of what someone her size ought to weigh... Sylphs are part Elemental Air, and as magical creatures, don't fully obey the Laws of Physics.
Breeze already has a bag of macarons, purchased from a nearby shop. The puffy, airy, and adorably colorful cookies are everything a Sylph could like, and one of the reasons that they also tend to linger in Paris. An assortment of rainbow colors in a bag.
She pauses when she sees this is a Library Meeting. Sort of, at least. She's heard of that dog, and she knows it is a sign of Serious Things Afoot.
"This is Library Stuff, isn't it?" she asks. "Have I done something wrong? I didn't mean to."
Most of the Fey who live in the city know there are limits to their behavior, guiding their interactions with Humans, and these limits are for their own good. And also, the good of the Humans of the city, who outnumber the Fey well over a thousand to one and could be dangerous if it dawned on them that magical creatures actually live in the world.
Fey folk also know that breaking these limits attracts the attention of the Libray.
"We're still going to have a picnic, though, right?" she adds hopefully.