moveable

Something which is movable; an article of wares or goods; a commodity; a piece of property not fixed, or not a part of real estate; generally, in the plural, goods; wares; furniture.

Capable of being moved, lifted, carried, drawn, turned, or conveyed, or in any way made to change place or posture; not fixed or stationary

Changing from one time to another

“This feast is movable - its date varies from year to year.”