Free concerts by Lady Antebellum and Miranda Lambert are among the activities surrounding the 45th annual Academy of Country Music Awards taking place April 18 in Las Vegas. On April 16, Lady Antebellum will be performing downtown at the Fremont Street Experience. Lambert will take the stage on April 17. Winners in each of the ACM's newcomer categories -- top new solo vocalist, vocal group and vocal duo -- will also be invited to perform during the free shows. Montgomery Gentry will host the ACM Chairman's Ride, an invitation-only motorcycle ride for artists and music industry VIPs. Later that day, Montgomery Gentry and Randy Houser will perform a free, private concert for those stationed at the nearby Nellis Air Force Base. The event is sponsored by ACM Lifting Lives (the organization's charitable division) and the USO. Tickets are already on sale for the April 19 taping of ACM Presents: Brooks & Dunn -- The Last Rodeo, a CBS television special featuring Kenny Chesney, Reba McEntire, Rascal Flatts, Carrie Underwood and Keith Urban, among others.