Gather a group of volunteers, and go door-to-door spreading Christmas cheer. Caroling fundraisers don't typically require too much preparation, but make sure to rehearse a few times before you start, and print copies of the lyrics for singers who don't have them memorized. Either visit houses at random and ask for a donation after singing, or sell Christmas “grams” that people buy for friends or relatives that you serenade. Advertise your caroling fundraiser with your church group, at your office, or in your neighborhood, or write about it, in a local newsletter, an email blast, or on physical posters. Spread joy for the holidays through music and charity!