AUSTIN, Texas -- Willie Nelson announced that he will headline a concert and rally in support of Beto O'Rourke.

The event will be held at Auditorium Shores on the night of Sept. 29. The concert will be open to the public. People can register at www.betofortexas.com/beto-willie.

O'Rourke will be in attendance and address the crowd. This will be the first public concert Nelson has held for a political candidate.

"My wife Annie and I have met and spoken with Beto and we share his concern for the direction things are headed. Beto embodies what is special about Texas, an energy and an integrity that is completely genuine,” said Nelson.

O'Rourke is running for the U.S. Senate seat currently held by Ted Cruz, and has already visited all 254 counties of the state. 

"Amy and I have had the amazing opportunity to talk with Willie and Annie about the kind of future we want for our state when everything we care about is on the line. We are grateful to have Willie's support as we continue running this race the right way: no PACs, no corporations, no special interests -- just the people of Texas coming together to do something absolutely incredible,” said O'Rourke.

O'Rourke recently appeared as a guest at Willie's July 4th Picnic, where he joined the band onstage to play guitar and sing during the final medley of songs. A recap of their set has been viewed hundreds of thousands of times.

The event will also feature musical guests Lukas Nelson & Promise of the Real, Particle Kid, Carrie Rodriguez, Tameca Jones, and Joe Ely.