The Consumer Electronics Association, ESPN, and local retailers including retail stores, are celebrating “National 3D Demo Days” from now through Sept. 12. The motivating factor for the 3D showcase is obviously the need to entice Americans into buying 3DTVs, seen as the next big thing in living-room consumer electronics. The CEA, for example, predicts that Americans will buy 3 million 3DTVs in 2010 alone. The organization’s research also says that among consumers who have seen 3DTV, nearly half rated the experience as “excellent” (46 percent), and eight in ten (79 percent) rated the visual experience positively.