(DC) (US Botanic Garden) Sip festive botanical cocktails with the Friends of the U.S. Botanic Garden as you enjoy exclusive after-hours access to Season’s Greenings: Dino-Mite! Wander the Conservatory adorned with poinsettias, holiday decor, and beloved D.C. landmarks crafted from plant materials. Outdoors, delight in the G-gauge model trains chugging through displays of dinosaurs made from plant parts, including Tyrannosaurus ...