Blaise was there. He walked Daphne down to Hogsmeade, but made it a bit difficult for her to leave (because he really wanted to spend the day with her) and attend to her mysterious plans. After that, he spend the rest of the time with Astoria, mostly thinking, and but her whatever she wanted at the shops that they went into. He also bought Daphne something too, because she knows that he likes to spoil her every now and then. Not sure what though. He would have been cordial towards those he enjoyed their company that came around them.