Eight-year-old Ava Cassidy was one of the first people in line outside the Buell Theatre Thursday night, ready for the doors to open to the world premiere of Disney’s “Frozen: The Musical.” Although it was 86 degrees outside, that didn’t stop her and sister Peyton, 6, from excitedly donning their icy Anna and Elsa costumes to watch one of their favorite movies come to life on stage for the first time ever. Brother Jake, 7, went with a gray T-shirt, but mom Tami said he was just as excited even though he played coy. The stage adaptation of the massively popular animated Disney film premiered to the public in Denver on Thursday night to a sold-out crowd.