Here is a list of terms we use in the event industry.
A slightly elevated outdoor shelter that can come with or without seating used for a variety of events. Gazebos are usually made of wood and are open so they are best equipped for the warmer months. When found in parks, they are usually quite large and used for picnics or other gatherings. Gazebos found in home or other private spaces are smaller and can be decorated in any manner. Another common usage is for weddings, where the wedding party or just the bride and groom stand to say their vows.
A durable subfloor that can be placed on any surface to resemble grass. The subfloor is usually made of a nonslip backing and velon or plastic green material. This is often used on film/tv sets in neighborhoods where grass is required.