The 20th Annual Los Angeles Music Awards' August Showcase happens Wednesday, August 25 at the world-famous Whisky A Go-Go, 8901 W. Sunset Blvd., West Hollywood, 7 p.m.-12 midnite. $12. 21 and over. Info: (310) 652-4202; log onto www.whiskyagogo or www.lamusicawards.com. Performing that night are 2010 LAMA Nominees the Farmers; Zoe Scott; Big Joe Hurt; Zombie Shakerbox; New Blues Revolution; Spirit Soul & Friends; Blues Gone South; and Brian Matthew.