The roundtable is intended for groups based in or serving East Contra Costa County and will continue to meet quarterly. This handy comprehensive checklist to help nonprofit 501(c)(3) organizations stay up-to-date with annual filing requirements.Contra Costa County Department of Conservation and Development is seeking proposals from nonprofit organizations, public agencies, and. The Contra Costa Board of Education uses BoardDocs, an online meeting records system. The Rainbow Community Center of Contra Costa County is accepting applications for its Board of Directors. Title: Provide an accurate and complete title for the event.