Average Socialite has posted that the John Wick 3 premiere in Los Angeles will be on Wednesday, May 15, 2019 from 6:00 pm- 11 pm. The theater is not give. I’ll update if I find more for those in the LA area.
Note: The last two films in the franchise had bi-coastal premieres so it is no surprise that the same will occur for John Wick 3. Average Socialite’s information for the NY premiere was correct.