We do stuff year-round too. We donate all of our 'out-grown' clothes, shoes, toys, furniture etc to the local non-profit thrift store. We are the animal house on the block, so often little critters find their way to us when they need a home or help. Gary and I are like the 'go to' people in our group of friends when someone needs help.
I have done a lot of community work over the years, from coaching youth soccer for 8 seasons, to doing 'tree tenders', to running our block parties and block improvements committee, to yearly volunteering at my kids' school.
This year I am an ESL tutor for 1.5 hours a week at my childrens' school. Every Tuesday, I work with 5th graders on their school work, projects and language skills.
I think charity really does begin in the home, so I encourage my kids to help each other and I try to set an example by doing things locally and in their school.