We live in a small village that is rich in community service opportunities, since we're not big enough to have things institutionalized. My 10-year-old has had tons of community service experience.
She sets up and cleans up the community hall for various events.
She helps sell popcorn at movie night, to support the event.
She hands out programs and watches over the donation basket at musical performances.
She sets up classrooms for summer music, dance and art workshops.
She helps weed the community gardens and the school garden through the summer.
She helps the instructors at the music-for-young-children camp that runs through the summer.
She volunteers with the local preschool and with Family Gym Night, helping some of the younger children.
She litter-picks along the highway and trails.
She bakes cookies and muffins for all sorts of community events and receptions.
... among other things that come up as one-off opportunities.
Not sure if anything like that is realistic in your community. One of the things that my kids have learned early is that community service isn't necessarily glamourous. There's a lot of emptying garbage cans and stacking chairs and sorting empty soda bottles. Participating in that stuff helps them appreciate all the behind-the-scenes work that others do. And it puts them shoulder to shoulder with a lot of hard-working altruistic people with interests and passions and expertise to share.