Keanna Irvin and Eric Hokanson have announced their engagement and plans to be joined in matrimony August 24 at Emerald at Queensridge in Las Vegas. Keanna is the daughter of Annie Moore of Las Vegas. Keanna graduated from Mojave High School in Las Vegas in 2001 and now works for Pioneer Services.Eric is the son of John and Victoria Hokanson of Roseburg. Eric graduated from Roseburg High School in 1994, attended University of Oregon and now works for Konami Gaming, Inc. …