This weekend alone – more than 300 people have signed up to become bone marrow donors at ACL.

The "Love Hope Strength Foundation" is a charity that registers people to become donors at music festivals across the country. And ACL is one of the leading music festivals for registry through Love Hope Strength.

Madeline Conley, 18, is an advocate for the program. She is now cancer-free.

But that was not the case in 2014 when she was diagnosed with acute myeloid leukemia.

"I ended up going straight from eating lunch at school to the hospital,” said Conley. “I pretty much lived in the hospital for about five and a half months."

But Conley likes to see the silver lining.

"Having cancer sucks,” she said. “But the people that you meet … my nurses are some of my best friends. I've met so many friends through cancer that are going through the same thing that I am. And I get involved with organizations where I can give back."

One of those organizations is the Love Hope Strength Foundation. The charity registers people at concerts to the National Marrow Donor Program.

"It is accessed by medical professionals worldwide on behalf of those suffering from certain diseases such as leukemias, lymphomas and sickle cell,” said Natalie James, executive director of the Love Hope Strength Foundation.

Some of the requirements include: Being 18 to 55 years old, not a member of the military and no cancer history.

"I was lucky enough to have [a donor],” said Conley. “I definitely wouldn't be probably alive today without the bone marrow registry … You could be that person for someone else."