Abstract: A convertible sports and exhibition facility includes stadium and arena configurations. Playing fields or surfaces are provided for both the stadium and arena configurations, with at least a portion of the stadium playing field being removable to provide a lower playing surface in the arena configuration. A seating system includes opposite pairs of end and side seating sections. The stadium configuration end seating sections become the arena configuration side seating sections and portions of the stadium side seating sections become the arena end seating sections when the facility is converted from a stadium configuration to an arena configuration. The facility includes a roof with an adjustable-height ceiling portion with a raised stadium position and a lowered arena position. The facility also includes circulation, structure and support systems.

Abstract: A multi-purpose stadium includes a seating system which is reconfigurable between seating configurations corresponding to different playing fields, for example, football and baseball. Reconfiguration of the seating system is accomplished by removing removable seating sections, raising or lowering vertically movable seating sections, sliding or shifting horizontally movable seating sections and rotating groups of seating sections which form rotatable extensions of seating wings of a seating bowl formed by the seating system. The stadium includes a circulation system with concourses at various levels for providing access to the seating system. Bridges are provided for connecting parts of the concourses which are separated when the seating system is reconfigured.