Why hadn't Marilla begun teaching Anne how to cook? What event was Anne eagerly anticipating?

Marilla hadn't begun teaching Anne to cook because she was too active, didn't have an attention span, and needed to be able to keep her mind on what she was doing.

"There, there, never mind your kissing nonsense. I'd sooner see you doing strictly as you're told. As for cooking, I mean to begin giving you lessons in that some of these days. But you're so featherbrained, Anne, I've been waiting to see if you'd sober down a little and learn to be steady before I begin. You've got to keep your wits about you in cooking and not stop in the middle of things to let your thoughts rove all over creation. Now, get out your patchwork and have your square done before teatime."

Anne was eagerly anticipating the Sunday-school picnic.