The Elephant’s Perch, an iconic outdoor sporting goods store long owned by Bob and Kate Rosso, will celebrate its 50th anniversary on Thursday, Feb. 5, with sales and refreshments. Here’s a look at a video interview Eye on Sun Valley did three years ago with Rosso, who was among those who helped kickstart modern-day Nordic ski racing in the Wood River Valley and create the 34 K Bouler Mountain Tour, which will be staged again on Saturday.