They say the Volkswagen, which is decorated with rainbows and peace symbols, is a public art installation, but city officials say the van is an abandoned vehicle and must be removed.
The car's owners, a family in Washington's Palisades neighborhood, are asking neighbors to come to a 1960s-themed rally Sunday to save what they call the "Peace-Mobile."
The vehicle, which no longer has an engine, has been sitting in the family's yard since the spring. After a neighbor complained, city officials said they would remove it by the end of October. Under D.C. law, an inoperable vehicle is considered abandoned if it is left on private property for more than 30 days.