Shortly after breakfast, Harry, Ron, and Hermione visit the kitchens to give Dobby the outlandish socks they picked out as a thank-you present for giving Harry the gillyweed for the second task. They also see that Winky is unhappier than ever. Before leaving, Harry, Ron, and Hermione take some food to send to Sirius (GF28).
Harry, Ron, and Hermione visit the kitchens after sending a letter to Percy once they finished breakfast. It is a Sunday in March, the day after the visit to Hogsmeade and Sirius's cave.