My Parents had recently applied to renew their B1/B2 Visa. It was due expiration in a few weeks. However, they received notification for an interview instead and have asked to only bring very limited stuff like passport, DS-160 completed form etc.

When they were here last time they stayed less than 6 months and did not violate any laws.

Anyone with a similar experience? From what I have heard most people visitor visa gets renewed without an interview.