Now that s’mores season is upon us, it seems there’s no better time to learn the art of making marshmallows. Dessert gurus from Three Tarts Bakery in Chelsea will teach the ‘mallow-crafting lesson as daring tots choose from tastebud-tingling flavors like mango and rosemary chocolate. Kids will bring home the recipe along with a gift from Three Tarts. Registration required. Ages 5 to 12.