Public-participation science communication can deliver trustworthy and relevant scientific content by empowering the public to direct their dialogues with scientists. However, evaluations of such programs have often been limited. This research assessed a 2025 public-participation environmental science communication event in South Australia. It aimed to explore who attended the event and why, their relationships with science, and if engagement was likely to encourage subsequent information dissemination. The study (N = 48) employed a mixed-methods survey design to explore participant demographics, pro-environmental dialogue activity, science trust levels and influences, and personal values. Through a pre-post component (n = 14), the study also explored changes in pro-environmental dialogue intentions and science trust. The results revealed that event participants came from narrow demographic backgrounds, were prone to pro-environmental dialogues, and generally trusted science and scientists. Moral trust factors were observed to most often influence science trust, and event engagement was often associated with conservation values. Pre-post comparisons revealed that event attendance resulted in statistically significant increases with large effects for pro-environmental dialogue intentions and science trust. The results suggest that, while such events may have limited audience appeal, they are an effective means of encouraging subsequent dialogues based on trustworthy information within communities.