For the 28th year in a row, the first Saturday in December will be Walk & Knock day in Clark County. Walk & Knock is our community’s largest annual food drive, with all donations helping to feed hungry neighbors right here at home. It’s an all-volunteer operation, and it stocks up local food banks and pantries for months.Food donations are needed. A folded bag is included in today’s newspaper; you can fill the bag — or use one of your own — and set it out at your mailbox or doorway by 9 a.m. Saturday. As many as 4,000 volunteers are expected to scour the county for donations, street by street and house by house, and bring them back to central sorting sites where everything is loaded into trucks and delivered to the Clark County Food Bank.The Food Bank will redistribute everything to 32 satellite food pantries and other emergency food sites.Nonperishable donations of canned meats and fish, beans, peanut butter, rice, soup, cereal, elbow macaroni, powdered milk, baby food, diapers and toiletries are all welcome. So are donations by check. No glass containers, please.Despite the name, volunteers try to do as little actual knocking and asking as possible. Please set your donation out so they can collect it and keep moving.If you miss Saturday’s pickup, don’t despair. Numerous local businesses and nonprofit agencies — including all Les Schwab tire and Cost Less Auto Parts stores, all Riverview Community and Umpqua bank locations, all Vancouver Clinic locations, both Vancouver community centers and many Clark County fire stations — are serving as drop-off sites for the stragglers. You can keep filling donation barrels there now through Dec. 9. The whole list of drop-off sites is at http://www.walkandknock.org/one/volunteer_barrels.htm.