Meanings of impromptu visit in English

During an impromptu visit there, they discover a treasure trove of history.

Or Carl, not after that impromptu visit from his wife's uncle this morning.

Mrs. Halifax, my daughter encouraged me to pay this impromptu visit.

She introduced him to Mrs. Hilyard, who smilingly accounted for her impromptu visit.

It was an impromptu visit, but we need more information.

Then he worried that maybe she had already paid an impromptu visit to Goose Cove.

Leo had pre-empted the possibility of an impromptu visit.

She'd been seeing the guy since long before she'd paid me that impromptu visit before Christmas.

Their impromptu visit disrupted business and the confrontation had to be defused by a private security company.

So I decided to go to Goose Cove, as if I were paying an impromptu visit to Harry.

You never know when your in-laws might plan an impromptu visit, so you might as well get prepared now.

Her black dress seemed inappropriate for an impromptu visit, even though it might be what Berman wanted to see.

One distressed junior made an impromptu visit to my office this past winter while Petra played happily under my desk.

She hurriedly started the engine and drove off, sure that she'd done more harm than good with her impromptu visit.

But she stayed mostly at Mycenae, and the journey was just long enough to give one pause in making an impromptu visit.

Who'd had a good long moment of telepathic communication with her underlings before she began the artificial flurry of primping for the impromptu visit?