Tips to Make Villagers Get to Know Each Other
It works by using the Greet option. But instead of picking someone they know already you can pick a character directly from the villagers’ bar.
Also have your villagers share same job in workplace increase the chance to get to know each other – getting in relationship trait like acquaintance, rivalry, secret crush, etc. (may positive or negative).
I think having share same or opposite traits like mean-kind, lazy-diligence, increase the chance to create positive/negative relationship which led to trigger an event.