The data capture for the study focused on gathering information on how climate-related extreme events, particularly heatwaves, impact the health, well-being, and daily activities of children, young people, and parents (CYPP) in cities. The study targeted 179 cities worldwide (the Children, Cities, and Climate Action Lab's focal cities). Events (Heatwaves and Non-Heatwaves) were automatically identified using Airtable and Open Meteo APIs based on specific temperature thresholds. Heatwaves were defined as temperatures exceeding the 90th percentile for three consecutive days. Direct advertisements targeted youth and parents within the identified cities using Meta (Facebook and Instagram) and Google ads (Gmail, YouTube, and Google Search). The ads targeted users based on age and location. The ads directed users to a Typeform link (https://www.typeform.com/) where the survey was hosted. The survey link was designed to open in the most spoken language of the city to maximize accessibility and participation.