Kelly McDonald, a Texas-based marketing expert, has been invited by the Iowa chapter of the American Marketing Association (AMA) to talk about how diversity of thought helps companies remain competitive. “Diversity in America: How to Work With and Market to People Not Like You” will take place from 11:30 a.m. to 1 p.m. during the AMA’s April 13 luncheon at Des Moines Golf & Country Club, 1600 Jordan Creek Parkway in West Des Moines. The cost is $20 for AMA members, $30 for nonmembers and $15 for students. For more details, go to www.amaiowa.com.