I read a book when I was a kid 1993, the book felt modern) that was about a girl who was invited to sleepover at her friends house for the first time. Main girl is white and the friend is black. She’s very anxious, one thing she worries about is they will serve something weird for dinner like an octopus. She goes and they have a good time, in one part they run through cornfields at the friends house. It’s definitely geared towards 7-12 age group, some illustrations. I’ve been searching for years!!