Volunteer opportunities, provided by Volunteer! United (formerly Volunteer! Baton Rouge), are outlined in this column every Sunday. To learn more about these opportunities, contact the listed agency directly.

OPEN AIR BIKE REPAIR, Open Air Ministries — Trippe Hawthorne, (225) 229-2555 or trippe.hawthorne@keanmiller.com: Put your hands to work to help others get around town. This group needs help refurbishing donated bikes to be given away to homeless people in the community. Prior experience working on bikes is not necessary. Work days this month include Saturday or March 23 or March 30. For more information about how to help, contact Hawthorne.

ROCKIN’ AT THE SWAMP, BREC’s Bluebonnet Swamp Nature Center — Tonya Dixon, (225) 272-9200, ext. 446, or volunteer@brec.org: Do you love nature and the outdoors? Volunteer for Rockin’ at the Swamp.

The event provides visitors the opportunity to explore the vast world of geology, and includes activities and displays about rocks, gemstones, minerals and fossils. It will be held from 8 a.m. to 4 p.m. Saturday. Help is needed in the Stone Craft Corner, Treasure Trail, Gold Mine or at a check-in table. For more information, contact Dixon.

TREES AND TRAILS, LSU AgCenter’s Burden Center — Penny Miller, (225) 937-3632 or TntDocents@gmail.com: Trees and Trails is looking for additional volunteers to help guide fourth- through seventh-grade students through the trails at Burden for environmental and nature lessons. The 12 spring sessions will be held from late March through mid-May, primarily on Wednesdays, Thursdays or Fridays. Volunteers can select the days that work best with their schedules.

For more information, come to an orientation and overview at the Burden Conference Center from 9 a.m. to noon March 13. More in-depth training will take place after lunch for those interested in joining. For more information on Trees and Trails, visit http://treesandtrails.com/ or contact Miller.

Z-FEST, Zachary Arts & Music Festival — Megan Andrews, megan.andrews@hotmail.com: Be a part of this annual event happening in the Zachary community March 21-24. Volunteers are needed to serve in the drink, ticket and carnival ride booths, as well as serving as runners, parking attendants, parking pass/collections attendants and more. Sign up for shifts at the following times: 5 p.m. to 9 p.m. Thursday, 5 p.m. to 11:30 p.m. Friday, 10 a.m. to 11:30 p.m. Saturday and noon to 6 p.m. Sunday. Volunteers must be age 15 years or older. For more information or to sign up to volunteer, contact Andrews or visit http://www.zfest.us/.

MAKE A DIFFERENCE, Cancer Services of Greater Baton Rouge — Whitney Craig, (225) 927-2273 or wcraig@cancerservices.org: Are you interested in making a difference in the life of someone living with cancer? Become a volunteer with Cancer Services of Greater Baton Rouge. Receptionist and clerical volunteer opportunities are available Monday through Friday.

Duties include answering the phone, and greeting clients and visitors. Computer knowledge is helpful but not necessary. A minimal commitment of two- to three-hour shifts on one or more day(s) per week is asked. For more information, contact Craig.