The rain was falling during the ceremony originally scheduled for outside at the gazebo.  The rain forced the couple to say their vows under roof in the reception facility.  Three rows of chairs were set up front for family and the first arriving guests, then everyone else was seated around the reception tables.  This is commonly known as "banquet style seating."  The backdrop for the ceremony was the beautiful outdoors, green grass, trees, and all of nature including the rain!  It was absolutely beautiful for plan B.  After the ceremony, that location became the dance floor.  Worked wonderfully without a single glitch.  The entire evening was very cozy and romantic in the pavilion with dim lights, candles lit, and rain falling outside.