Here are some ideas...
Teach a child a fun craft or hobby: Teach a child how to plant a tree, sew a blanket, paint a picture, or how to ice skate. The possibilities are endless, and this is a gift that will stick with a child forever.
Go on a family hike and winter picnic: It may be cold outside but nature is perky and alive in the winter and well worth seeing. Learn how to safely get outside for a winter hike, camping trip, or winter picnic.
Make some home improvements for someone: Weatherize someone's home, clean out their attic or basement, plant some flower bulbs for them that will pop open in the springtime.
Plant a winter organic garden with the family: A winter garden leads to more family time, self sustaining living, and fun.
Plan an event day: You can hold a cookie baking day, a homemade Christmas ornament making day, a fun no-waste potluck, a snow-fort contest, and more.
Plant a tree: You can plant a tree in someone's name and take them along for the event. You get to help the environment and spend time together.