Thursday was a day of the week.
Every Thursday, Rachel took her "kids", the Second Doctor, Jamie McCrimmon and Victoria Waterfield, to see Face-Painter so he could tattoo their empty faces. (PROSE: Face-Painter)
During the summer of 1966, eleven incarnations of the Doctor visited Andy Warhol separately on Thursdays. Warhol painted a painting of the faces of those eleven incarnations. (PROSE: The War of Art)