Adjective : a movable holiday.    From Dictionary.com. 

This is the result of the movableness of his artificial teeth.    From Wordnik.com.  [Impressions of a War Correspondent] Reference

This frequent removing of the tabernacle in all their journeys signified the movableness of that ceremonial dispensation.    From Wordnik.com.  [Commentary on the Whole Bible Volume I (Genesis to Deuteronomy)] Reference

Liberty in spirituals was adorable to him, but for liberty in temporals he never seems to have had more than a very distant and verbal kind of respect; just because, with all his unmatched keenness of sight, he failed to discover that the English sturdiness in the matter of civil rights was the very root and cause, not only of that material prosperity which struck him so much, and of the slightness and movableness of the line which divided the aristocracy from the commercial classes, but also of the fact that a Newton and a Locke were inwardly emboldened to give free play to their intelligence without fear of being punished for their conclusions, and of the only less important fact that whatever conclusions speculative genius might establish would be given to the world without interposition from any court or university or official tribunal.    From Wordnik.com.  [Voltaire] Reference