I help organize student groups and churches that are looking for volunteer opportunities in San Francisco. I have worked with Glide Memorial Church, www.glide.org and have received positive feedback from those groups that have volunteered there. Glide has daily meal services for the disadvantaged and I've heard that they especially need bag lunch assistants on Saturdays and Sundays from 9am-11am. They are located at 330 Ellis Street and you can speak to the volunteer coordinator, Kris Johnson if you are interested in helping by calling her or asking for her email address.
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