Thinking Bigger Business Media has joined with Rainy Day Books for an upcoming author event featuring Facebook COO Sheryl Sandberg in conversation with Senator Claire McCaskill about Sheryl’s new hardcover book Option B: Facing Adversity, Building Resilience, and Finding Joy (co-authored by Adam Grant).  The event is Saturday, May 6, 2017, at 7:00 p.m. at Unity Temple on the Plaza. Admission packages are $25.95 plus tax and include the hardcover…