Should We Keep the Sabbath?

A recent AP article said: 'The lure of the Tennessee Titans played into one church's decision to start a Saturday night service. They get the same sermon and most of the same hymns ... most importantly, they get Sunday morning free to watch the Titans, let their children play in a youth soccer game or engage in other family activities.' Do we observe the Sabbath Day today? Is this a ceremonial regulation that was part of the Old Covenant, or a command that is being disregarded by the church today?