This article provides a new insight into knowledge-based management of mega-events by highlighting the significance of weather at destination selection and scheduling events as an adaptive strategy toward climate change. Concerning the environmental and socio-economic costs of weather ignorance in event management, which may result in cancelation and change of the event time, it is recommended that planners perform a preliminary study prior to publicizing an event plan. Doing so, the organizer and visitors can benefit from optimal weather at the destination, as this study advises the decision-makers of the Tokyo 2020 Olympic and Paralympic Games to reschedule the dates of this international event.