The following video is a presentation on Force Majeure and contractual performance in the current climate. It includes tips on effective drafting and real world examples of invocation of force majeure as a defense.
Force Majeure Clauses: Contractual Performance Amidst a Pandemic A presentation by Erick Kraemer, Esq. of Colligan Law LLP
https://www.youtube.com/watch?v=ZswOJYHQSkA&feature=youtu.be