The two acts have pulled out of this weekend's Delaware festival due to "medical conditions."
Ben Harper and Schoolboy Q will sub in for a pair of exiting acts at Delaware's Firefly Music Festival this weekend.
The Lumineers and Earl Sweatshirt have both cancelled due to "medical conditions," the fest announced on its Facebook page. Sweatshirt recently pulled out of Bonnaroo due to pneumonia.
"To everyone who think im being overdramatic, go get pneumonia and then try singing 'whoa' all the way through with no hypeman," he tweeted last week.