Many thanks to A for bringing this to my attention!
Joey Banuelos, who was one of the students on the International Student Exchange field trip to the Hollywood Bowl yesterday, has posted the following in the comments thread on his FB page:
ISE students on the LA tour. Hollywood Bowl. Keanu was there on a photo shoot for his new movie.
Update: I am cross posting since the response I got from barbaraaab on IG backs up what the student said. She replied:
@mr_r_news_blog he wasn’t filming he was just doing some pics on his awesome motorcycle
Note: The photo shoot is most likely for promotion for the upcoming John Wick 3 release. To have magazine covers and articles ready for the upcoming release in mid May, they need to start now.