Open Monument Day in Germany
Open Monument Day in Germany is held on September 14. Held on the second Sunday in September. This event in the second decade of the month September is annual. 
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The Heritage Day - in Berlin called "Day of the open Monument" - takes place every year in September and is a Europe-wide event.
Mainz Science Market on September 13
Freiberg Night Shift on September 13
Lollapalooza Berlin on September 13
Maritime Week Bremen on September 13
Kempen Autumn Fair on September 13
Viersen-Süchteln Autumn Fair on September 13
Feast of the Exaltation of the Holy Cross on September 14
Discovery Day in Hanover on September 14
Intercultural Festival in Mainz on September 14
Citadel Festival in Mainz on September 14
Leipzig Film Art Fair on September 15