A girl enjoys beer during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

A staff member serves beer during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

A staff member serves traditional Bavarian food during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

Munich Mayor Dieter Reiter taps the first barrel of beer to open the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

A girl drinks beer during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

People visit a festival tent during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

A staff member serves beer during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

A staff member serves beer during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

People drink beer in a festival tent during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)

People enjoy beer during the first day of the Oktoberfest 2019 in Munich, Germany, Sept. 21, 2019. The 186th Oktoberfest, one of the world's largest folk festivals, officially opened here on Saturday. It is expected that around 6 million visitors from all over the world will enjoy festival beer and culinary delicacies here from Sept. 21 to Oct. 6. (Xinhua/Lu Yang)