Carrie Underwood, Jason Aldean, Julianne Hough, Vince Gill, Joe Nichols and Luke Bryan will be suiting up and hitting the field for the annual City of Hope Celebrity Softball Challenge set for Monday (June 7) at Nashville's Greer Stadium. During its 20-year history, the event has raised more than $2 million for City of Hope, a research, education and treatment center for cancer and other life-threatening diseases. With teams representing the Grand Ole Opry and After MidNite With Blair Garner, other country artists participating in the 7 p.m. game include Craig Morgan, Chuck Wicks, Colt Ford, Gloriana, Justin Moore, Trailer Choir, Keith Anderson, David Nail, Josh Thompson, the Oak Ridge Boys and Jaron and the Long Road to Love. Following the game, an online auction of memorabilia signed by country artists and sports celebrities will be launched at www.auctionsforhope.org. Tickets, priced at $20, are via Ticketmaster.