This fundraiser is (almost) exactly what it sounds like — the central idea is to produce a calendar of photographs of people in the nude, but use some well-placed objects to hide all of the “naughty bits” in each picture.
It's a fundraising idea that works particularly well for local public organizations with recognizable figures, though everyone who gets involved is going to need a light-hearted attitude to begin with. Whoever the volunteers are, you’ll need enough models and themes for 12 months of the year, one photograph for each month.
Enlist the help of a professional photographer and explain to him or her what the plan is from the outset. If the photographer is happy to donate time and materials for your cause then even better.
On top of this you're going to need a printing service to produce the physical calendars themselves. Liaise between the photographer and the printers to make sure the pictures are all in the correct format. This means you'll avoid running into problems at a later stage.
Remember that you don't have to take the project completely seriously. Many different organizations have had success with the idea, often using everyday people from all walks of life rather than professional supermodels.