Please answer the following question: Given the following context:  American pressmen had been alerted to an upcoming Buddhist demonstration to coincide with Double Seven Day at Chanatareansey Pagoda in the north of Saigon. The nine-man group, which included Arnett, Browne, AP photographer Horst Faas, David Halberstam, Neil Sheehan of United Press International, and CBS's Peter Kalischer and photographer Joseph Masraf waited outside the building with their equipment. After an hour-long religious ceremony, the Buddhist monks, numbering around 300, filed out of the pagoda into a narrow alley along a side street, where they were blocked and ordered to stop by plain-clothed policemen. The Buddhists did not resist, but Arnett and Browne began taking photos of the confrontation. The police, who were loyal to Ngo Dinh Nhu, thereupon punched Arnett in the nose, knocked him to the ground, kicked him with their pointed-toe shoes, and broke his camera. Halberstam, who won a Pulitzer Prize for his coverage of the Buddhist crisis, was a tall man, standing around 20 centimetres (8 in) taller than the average Vietnamese policeman. He waded into the fracas swinging his arms, reportedly saying "Get back, get back, you sons of bitches, or I'll beat the shit out of you!" Nhu's men ran away without waiting for a Vietnamese translation, but not before Browne had clambered up a power pole and taken photos of Arnett's bloodied face. The police smashed Browne's camera, but his photographic film survived the impact. The other journalists were jostled and rocks were thrown at them. Photos of Arnett's bloodied face were circulated in US newspapers and caused further ill-feeling towards Diem's regime, with the images of the burning Thich Quang Duc on the front pages still fresh in the minds of the public. Halberstam's report estimated that the altercation lasted for around ten minutes and also admitted that the pressmen had tried to apprehend the policeman who had smashed Browne's camera but were shielded by the rock-wielding policeman's colleagues. He also claimed that the secret policemen had also...  answer the following question:  What two events were the American pressman alerted to that were going to coincide together?
A:
Double Seven Day