Quarry Faces: May 2023. ConExpo-Con/Agg came and went in a flash, but several Pit & Quarry representatives were in Las Vegas for the duration of the March 14-18 trade show. This year's ConExpo-Con/Agg included a media day March 13. The National Stone, Sand & Gravel Association 's (NSSGA) Annual Convention, also in Las Vegas, …