Opening of carnival
Opening of carnival is held on November 11. "Karneval"/"Fasching", on 11-11, at 11:11. Germany, the Netherlands, and other countries. This event in the second decade of the month November is annual. 
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The 11th day of the 11th month is a magical date for Carnival-lovers. In German carnival strongholds, which include the Rhineland, and especially Cologne, Bonn, Dusseldorf, Aachen and Mainz, the season officially begins at precisely 11:11 a.m.
A jester called "Hoppeditz" awakes in Dusseldorf, Cologne greets its trio of fools and the traditional "Fool's Charter" is read in Mainz, accompanied by the famous "Narhalla" parade. These celebrations usually take place on the main square or in front of city hall in different cities. People go out wearing costumes, and local musicians as well as loads of alcohol keep the party going on all day. Some will keep partying throughout the night, as bars are also in Carnival fever.
In the United States the principal Carnival celebration is in New Orleans, where the Carnival season opens on Twelfth Night (January 6) and climaxes with the Mardi Gras festivities commencing 10 days before Shrove Tuesday.
Similar holidays and events, festivals and interesting facts
Martinisingen on November 10 (Germany);
Proclamation of the Foolish Basic Law in Mainz on November 11
Sint Maarten's Day on November 11 (St. Martin's Day: Sint Maarten, Kingdom of the Netherlands);
European Dystonia Day on November 15
National Reading Aloud Day in Germany on November 15
Stadtwerke Ice Festival on November 15
Statia Day, Sint Eustatius on November 16 (Caribbean Netherlands)