The removable seats system includes a number of vertically movable platforms (32) supported spacedly over ground by a ground-resting platform support and displacement device which engages the platforms and which positions the platforms in a horizontally successively adjacent although slightly horizontally spaced configuration so as to define a small horizontal gap between each two successive platforms, the platform support and displacement means further allowings selective independent vertical displacement of the platforms, the removable seats system further including a number of seat elements each associated to a coresponding platform and each including:- a row of seats (44) including at least one seat (46); and- a seat supporting structure (48) carried by a platform and supporting the row of seats. Each one of the seat members (42) is movable relative to its corresponding platform between an operative position in which the row of seats is located above its corresponding platform for allowing persons to sit on the seats, and a concealed position in which the row of seats is caried by and is located under a platform in an inoperative and concealed condition. In the operative position of each one of the seat members, the seat supporting structure extends through the gap between two successive platforms.