It takes the women half a day to put together a feast. It takes even longer, of course, if you want a very grand one, but she killed the walrus early in the day, and many people can interrupt their other work to cook. They won't eat half of the walrus tonight, even accounting for warriors' appetites, and can smoke the rest to help the settlement make it through the early parts of winter.
The walrus meat is complemented by cheese, milk, a few eggs, a limited (by Chelish standards) assortment of fresh vegetables, and - most impressive of all, to the Icelanders - some loaves of barley bread. These are spread thin along the whole length of the feast hall, on the theory that the Icelanders will be more likely than their foreign guests to associate bread with abundance. Even a feast with very little preparation also has music, dancing, wine (imported from the mainland, while it lasts), and stories - first from the warriors, who need a chance to brag to each other, and only later from Catherine. At home it would be important to send Catherine out while people are sober enough to appreciate her, but wine is not so plentiful here. She can afford to wait.
She seats her guests close to her and watches them carefully, trying to gauge what things impress them and which make them wary, what they find strange and what they find familiar.