What evidence is required to prove that false statements made at a party have caused harm in a defamation lawsuit?

In a defamation lawsuit, evidence is needed to prove that false statements made at a party have caused harm. This evidence typically includes showing that the false statements were communicated to others, that they were damaging to the reputation of the person being defamed, and that there was a direct link between the false statements and the harm suffered. Additionally, evidence of any financial losses or emotional distress resulting from the false statements may also be required to prove harm in a defamation lawsuit.