Which collaborations has Natasha Nicholes engaged in with Macy's chefs?

From the available content, Natasha has covered and attended Macy’s events featuring:

• Stephanie Izard (Girl & the Goat, Little Goat, Duck Duck Goat) – including a Macy’s Culinary Council introduction event and later holiday cooking demos
• Nancy Silverton – a Macy’s State Street holiday cooking event where both she and Stephanie Izard shared recipes

Would you like a quick summary of what each of these chefs demoed and offered at those Macy’s events?