If you are looking for some guidance about how to approach event cancellation/postponements in relation to everything shutting down due to Covid-19, I had a post go up on ArtsHacker today pointing to some advice and resources.
I cite some advice provided by arts lawyer Brian Taylor Goldstein as well as an FAQ issued by North American Performing Arts Managers and Agents (NAPAMA) which appears to be in the process of continual updates as things unfold.
Handling Contractual Elements of Event Cancellations Due To Epidemics & Other Crises