In anticipation of the Tokyo Olympics, Japan is attaching importance to create an attractive sightseeing region. As one method to activate sightseeing by utilizing local regional resources, open data promotion is currently paid attention. However, there are many local governments that have not started to open data promotion because they are concerned that their work load will be increased and they have no idea about its needs since there are still few utilization cases of open data. The purpose of this study is to open data promotion at autonomous works, and an open data promotion of sightseeing event information by co-operating with local government was conducted. Regarding open data promotion that was conducted, this study worked on converting information that local government has kept so far, to open data, developing event guide application by utilizing it, and revealing its usefulness by a demonstration experiment.