Event sails are mostly membrane structures, i.e. high point sails which can offer shade to oversized areas. For example, festival areas are typically built in this form. The sails are usually used for a specific period of time, at events, festivals, open-air games, playgrounds or at celebrations on company premises, etc. Areas can be shaded within a short amount of time so that rain or a change in the weather will not pose a problem for the event. Such systems can also be manufactured with side wind protection just like in tent construction.