Van de Brooke, an Orinda resident and elected member of the Contra Costa Community College District, and Andersen, mayor of Danville, will answer questions and discuss their platforms.
The third supervisor candidate, Sean White of Lafayette, is out of town and cannot attend.
The Contra Costa Council is a nonprofit membership and nonpartisan organization that advocates for economic development throughout the East Bay.
I am the moderator and the event is open to the public.
Registration begins at 11:30 a.m. followed by the program at noon. It will be held at the Lafayette Veterans Memorial Building, 3780 Mt. Diablo Blvd., Lafayette.
Tickets are $45 for non-members and $35 for members. For reservations, contact the Contra Costa Council at www.contracostacouncil.com or 925-246-1880.