CityNet Secretariat successfully organized a series of city-to-city (C2C) cooperation sessions on Dengue fever prevention and preparedness on February 6-7, connecting Lalitpur, Makati, and Colombo. The design of this C2C project is expected to be replicated in the near future for CityNet members to respond better to urbanization issues building reciprocal cooperation among cities. This report summarizes the highlights of each city's practices based on the knowledge gathered throughout the two consultation sessions.