Volunteering Is Easy All you need to do to sign up is to call the RSVP office in Sacramento at (916) 875-3631 for an appointment. There you will be given information about the benefits of volunteering, as well as provided consultation on a wide array of volunteer opportunities. Read About the Benefits of Volunteering Print a Volunteer Registration Form Look at Current Opportunities Sacramento Retired Senior Volunteer Program (RSVP)  - for those age 50+