Lucy Dacus is making her orchestral debut with the Chicago Philharmonic. It's a full circle moment.

In 2016, singer-songwriter Lucy Dacus made her debut at Lollapalooza, in Grant Park. Then just 21, she was an early, first-day act on the BMI Stage, one of the festival’s smallest — a slot that has become dubbed the “Lady Gaga” slot, after the pop icon performed there the year before her breakthrough album “The Fame.” “I was super nervous,” Dacus recounted in a video call from her home in Los Angeles. “I lied about how big my crew was to get my friends in. I was like, ‘Yeah, this is my…