It's one thing to do regular code deploys and there is no harm in doing it on fridays, if the code happens to be ready. If something goes bad, you rollback, which hopefully is automatic.
But, pushing features out the door is different than just deploying, so seems this is what happened. Then it doesn't matter what day you release your unfinished feature, it's gonna cause bad times.
But, pushing features out the door is different than just deploying, so seems this is what happened. Then it doesn't matter what day you release your unfinished feature, it's gonna cause bad times.