TinEye found this earliest as of 03/24/2018. A gun control march.
It looks like it is also a Getty photo.
https://www.gettyimages.com/detail/news-photo/attendees-are-seen-at-the-march-for-our-lives-rally-on-news-photo/1068687862?irgwc=1&esource=AFF_GI_IR_TinEye_77643&asid=TinEye&cid=GI&utm_medium=affiliate&utm_source=TinEye&utm_content=77643
“It looks like it is also a Getty photo.”
Thanks, stylin. I hit abuse and asked the mod to delete it, and the post from norsky at 671 also.