It's a good rule to live by, and like all rules it can be overridden when the circumstances require. It's good to instill in your team that Friday deployments

It's a good rule to live by, and like all rules it can be overridden when the circumstances require. It's good to instill in your team that Friday deployments should be done only in special circumstances, or they become a habit (and people inevitably end up working Saturday). But yes, sometimes it's necessary.