> Plenty of companies exist whose busiest times are weekends, or where events happen at weekends for which systems need to be available This is a reason to not

> Plenty of companies exist whose busiest times are weekends, or where events happen at weekends for which systems need to be available This is a reason to not do Friday deploys. It's always going to be harder to get anything done on weekends if stuff goes wrong, you don't want to add in deploys to that. For example, contacting a third party provider will be harder on a weekend. I can see the reasons for a Friday deploy - if it must be done or it's just low stakes (which applies to a lot of projects where everyone can just go home and fix issues on Monday with some mild grumbling) then it's fine but otherwise I do think avoiding deployments on a Friday is a very good rule. They certainly shouldn't be routine unless you've got very good justifications.