Looking for a festive backdrop for your holiday greeting card? Pose with a backdrop of hundreds of colorful poinsettias at Mischler’s Florist and Greenhouses, 118 South Forest Rd., Williamsville. This unique opportunity is part of the Holiday in the Village of Williamsville celebration presented by the Williamsville Business Association. The backdrop will be available from 10 a.m. to 4 p.m. Friday and Saturday, Nov. 29 and 30, and Saturday, Dec. 7. In addition, beautiful classical and holiday music will be…