Moms obviously make great babysitters! See if they'd be willing to organize a Parents' Night Out as fundraiser for other busy parents!
Make sure folks know your Build Day can be a family volunteer experience!
Moms are great children's activities volunteers!
Moms love finding good homes for outgrown kids' clothes and toys. Ask them to donate used clothing and toys for a fundraising sale!
Add more ideas by clicking the "Edit" link above!