Service Assurance Act of 2020 This bill exempts nonprofit organizations from liability for any act or omission relating to harm arising from exposure to, or infection by, the coronavirus (i.e., the virus that causes COVID-19) during the COVID-19 public health emergency. However, this exemption does not apply with respect to acts or omissions that constitute willful or criminal misconduct, gross negligence, reckless misconduct, or conscious and flagrant indifference to the rights or safety of the individual harmed.