The famed pastry chef will appear personally with what we hope is a very large batch ofCronutson Saturday, March 1 at Barneys atthe Grove. The promotion, which benefits Heart of Los Angeles, a nonprofit that organizes after-school activities, will be held from 10 a.m. until 2 p.m.,or until the Cronuts run out. We’re going to guess that’s happening on the sooner side of things. [Dominique Ansel/Twitter,Earlier]