Today Trevor tweeted that they will return to LA for a few days so it seems that Chloë will attend the Event at 12th June. I just also looked for the Saturn Awards, they will be award at 20th June in Burbank, so there're big chances that Chloë attend it too. Maybe after this event she will go back to Toronto to continue filming Carrie. (Or maybe she has to fly back after the Women in Film Awards).
Greets from Germany, marcel