Why are they at the feast?

Tagged as RoW because of character reveals.

Re-listening to Words of Radiance… In the prologue, Jasnah passes two men on her way back to the feast, one looks Azish, dresses in black and silver, and has a birthmark on his cheek. The other man looks Alethi, is shorter, and has thinning hair. These are certainly Nale and Kalak, but what are they doing at the feast? Nale and the skybreakers hunt down budding radiants, is he looking for Jasnah? But then why would Kalak be accompanying him?