See
>Who else was there?
Possibilities…
https://www.google.com/search?q=Chateau+Marmont+October+16,+2015&client=ubuntu&hs=hrQ&channel=fs&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwj0p6Oz-azcAhVqilQKHaS-C1EQsAQILg&biw=1287&bih=860
Gaga was there around that time, not sure if she was there for this event, but it wouldn't surprise me.