Parvati was a little bit surprised at the invitation, as the next Hogsmeade was a little ways off, and she didn't really know Seamus to be the type to plan that far ahead. At the very least, she generally wasn't. But she was pleased with it nonetheless, which showed on her face.
"I could probably pencil you in," she said with a grin. "But only because you've given me ample notice, of course," she added, though she gave him a warm smile that suggested she'd have said yes even with significantly less lead time.