Since October 3rd 1997, the official reunification day of Germany and a public holiday, Islamic organizations and associations held the “day of open doors”. Mosques and Islamic centers all over Germany open doors to invite and gather Muslims and non-Muslims for better inter-religious and cultural understanding. They organize exhibitions, concerts, information desks and discussions. Since 2007, the coordination council of Muslims acts as the patron of this day initiative. The slogan of the event of this year was called “ecology and environmental protection”. Muslims associations aim to show the German public how challenges such as climate change and pollution are of concern of all citizens independent of their religious affiliation.