Many thanks to Ayako for tweeting the link!
Daum is reporting that the press conference for John Wick on January 8 at 11:00 am at the JW Marriott Hotel. Later that day Keanu will meet with fans at the red carpet premiere which will be held at 19:20 (7:20 pm) at the Megabox Cinema.
Note: As a frame of reference, Seoul is 14 hr ahead of NYC so the press conference will be on Jan 7 at 9 pm ET and the premiere will be Jan 8 at 5:20 am. You can use the world clock to figure out comparable times for your location.