What is an Energy day? I had not heard of one before and found some information online about a scheme in place with the European Commission, for Sustainable Energy Europe.
You can arrnage to have a local Energy Day or even Week. It is an action aiming to involve the wider public in a wide range of activities related to the production or use of renewable energy sources and energy efficiency. Usually organised at a local, regional or national level for a specified period, the types of activities may vary, but normally include one or more of the following :