A mother who attended Riot Fest with her son is expressing gratitude to Green Day after becoming separated from the boy at the festival on Sunday (Sept. 21).

How Did the Mother Become Separated From Her Son?

Bobbi Cantrell traveled from Indiana with her son, Argyle, to see Green Day during the final day of Riot Fest at Douglass Park in Chicago on Sept. 21 as part of his 16th birthday celebration. The pair arrived around noon to secure a spot near the front of the stage for the band’s 8:15 PM set.

Argyle also brought along a sign with a special request for Green Day:

Hi! It’s my 16th birthday! I’m autistic and Green Day is my special interest. Can I come onstage and sing ‘Know Your Enemy?’

With the sign in hand, Argyle remained at the front of the crowd throughout the long day of music. Eventually, his mom needed a break and looked for a bathroom.

Unfortunately, the crowd of music fans had filled out significantly, making it difficult for Bobbi to return to Argyle near the front of the stage.

“I was in panic mode all day because we got separated when I went to the bathroom and couldn’t get back to him,” Bobbi said in a comment shared on Green Day’s Instagram.

How Did Green Day Make a ‘Dream Come True’?

By the time Green Day took the stage, Bobbi still had not reunited with her son. However, what happened next helped ease her worries.

Three songs into their set, Green Day began playing “Know Your Enemy.” At the song’s midway point, Billie Joe Armstrong stepped to the front of the stage.

READ MORE: 6 Big Things That Happened at Riot Fest 2025

“I have a really bad chest cold right now. I do. I’m a little bit sick right in here,” Armstrong said as he tapped his chest. “So I need a volunteer. Who knows the lyrics to this song? Who knows it?”

Then, Armstrong invited Argyle onstage and gave him a big hug before handing over the mic. Argyle flawlessly sang every lyric in front of thousands of cheering fans.

Bobbi finally saw her son again.

“THANK YOU for making my amazing kid’s dream come true and easing my anxiety,” she said in a comment on Armstrong’s Instagram. “As soon as I saw him onstage, I screamed, ‘OMG THAT’S MY KID!!!!!’ What an amazing night! I am a new fan forever.”

Armstrong’s Instagram later reshared Bobbi’s comment along with more photos of Argyle onstage with the band.

Green Day is next set to perform at the Oceans Calling Festival in Ocean City, Maryland on Sept. 26.