By: Jura Koncius (washingtonpost.com) Mary-Liz Lichtenfels got burned in last year’s pandemic Christmas tree shortage. And instead of hosting 19 people for the holiday, it was just her, her husband and their three millennial children. It was a quieter celebration, but Lichtenfels, who runs the McLean, Va., staging business Redesign by ML, says all of that uncertainty gave her the courage to mix things...