"旅行见闻讲演" can be translated into English as "Travel Experiences and Observations Lecture" or, more concisely, "Travel Tales Presentation".
"Travel Experiences and Observations Lecture" emphasizes the sharing of personal travel experiences and the observations made during those travels, suitable for a more formal or educational setting.
"Travel Tales Presentation" is more casual and focuses on the storytelling aspect of sharing travel adventures, which might be more fitting for a less formal or more entertaining context.
Choose the one that best fits the context and tone of your event.