Virtual Author Event: Ciarra Siller Vegan Chocolate Treats. Join Napa Bookmine on Sunday, Oct. 18 at 5 p.m. for a virtual event with author Ciarra Siller and her forthcoming cookbook Vegan Chocolate Treats: 60 Indulgent Sweets to Satisfy Your Inner Chocoholic. This is a free virtual event. You must RSVP to attend at read@napabookmine.com. No purchase is necessary to attend, but if you are interested you can pre-order a copy of Vegan Chocolate Treats at www.napabookmine.com.