From ACS National Meeting & Expo:
"Safety is a core value of the American Chemical Society, and as such the health and well-being of our members, community and staff are paramount. As a result, we are cancelling (terminating) the ACS Spring 2020 National Meeting & Expo scheduled for March 22-26, 2020, in Philadelphia.
The American Chemical Society (ACS) is the world’s largest scientific society and one of the world’s leading sources and authorities in scientific information. ACS is at the forefront of the evolving worldwide chemical enterprise and the premier professional home for chemists, chemical engineers, and related scientists around the world."
For more information please see the event organizers website.