Summary: This line chart shows the referral rate over time, calculated separately for men and women. The X-axis represents the event date. The Y-axis shows the referral rate percentage, calculated as the count of people who responded "yes" to hearing about the event from a friend (cevFb_hearFmFdCt = 'yes') divided by the total count of all responses including nulls (people who didn't respond). The referral rate is calculated separately for each gender per event date. Note: This calculation includes both new and returning users, not just new users. Note: The Y-axis is scaled to 50% for better visibility of the data.