For 38 years, the Cajun Heartland State Fair has brought the lights, the rides and the sounds of summer to Lafayette, continuing to draw generations of families back to the Cajundome each year.Organizers say the fair has remained a staple in Acadiana by evolving over time while still keeping familiar traditions that longtime fairgoers recognize.Casey White, Cajundome marketing director, said many of todays visitors are now returning as adults wi…