Adele's Griffith Observatory concert was originally scheduled for Oct. 25. But when executive producer Ben Winston learned that pouring rain was forecast for that day, he and his team scrambled to switch to Oct. 24. That meant calling all the guests, including the many A-listers, to change their plans -- plus two long nights of working around the clock to prepare the space. “We called everyone on a Friday to say ‘Hi, thanks for coming to our show. Do you fancy coming in 48 hours instead of Monday?'” Winston told Variety. Winston also credited drone operator Gabe de la Parra for delivering “a love letter to Los Angeles” along with director Paul Dugdale. As for how Winston and his team found its engagement couple, they put ads out seeking men who were looking to propose to their girlfriends in a “spectacular way” but had no reference to Adele. Respondents had to list Adele as one of their favorite artists.