I applied online. The process took 2 months. I interviewed at Ogilvy (Boston, MA) in Feb 2019
Interview
Super Saturday was very intense, although I'm not sure at what benefit. The feedback I received after participating was EXTREMELY minimal and very disappointing after flying to be in NYC for two days, while being a college student.
Interview questions [1]
Question 1
What would you do if all the rooms in your office building were booked and you needed to book a room for a meeting?