The altitude isn’t the only thing that may make attendees of the 51st Telluride Film Festival giddy. The sea-level visitors to the globally renowned fest in the town beneath the jagged San Juan Mountains hear the cautions: “Ease up on the caffeine, drink plenty of water and take it easy on the cocktails.” But post-pandemic and after last year’s dual labor strikes — which prevented actors from attending film fests to support their work — something feels different headed into the Labor Day weekend ritual. “I feel like the program has an element of exuberance to it,” executive director Julie Huntsinger said in a call.