Plan and conduct an interview with a longtime local resident about how the community has changed, using open-ended questions and follow-ups.
An interview with someone who has lived in your community a long time is a genuine primary source for local history -- their real memories are evidence, the same way an old photo or building is. The best interview questions are open-ended, meaning they cannot be answered with just "yes" or "no." "What did downtown look like when you first moved here?" gets a far better answer than "has downtown changed?"
A good follow-up question keeps the story going: "what was that like?" or "can you tell me more about that?" often gets the most interesting, detailed answer of the whole interview.
Mastery looks like: They plan and conduct, or thoughtfully report on, a real interview using open-ended questions and at least one follow-up.
Common stumbles: Asking only yes-or-no questions, which shuts a story down instead of opening it up.