Build-A-Bear Workshop is inviting teddy bear fans of all ages to celebrate National Teddy Bear Day in stores on Sept. 8 and 9. During the two-day celebration, guests can make their own limited-edition National Teddy Bear Day Bear for $5.50 plus tax. (PRNewsfoto/Build-A-Bear Workshop, Inc.) Survey Commissioned by Build-A-Bear Workshop Reveals Adults Hold on to Stuffed…