Many thanks to @Keanuital for tweeting the clip!
Keanu watched the Mayweather vs. McGregor fight at Bojana Novakovic’s house. There was a flash of Keanu as the room was panned.
She posted the clip on instagram story.
Update: There is an additional photo from the fight party floating around on twitter and instagram. The photo was taken from Autumn MacIntosh’s instagram which is private. I won’t link to it here.