According the the report the featured show will be presented 5 times during the cruise.
Note that while you have a reservation it isn't for a specific seat or seats. You'll still have to get there early enough if you are with a group wanting to sit together.
There is a drawback to this though, and that is it diminishes the spontaneity many of us like. I often don't know what I will be doing on a cruise and make entertainment choices on the spur of the moment sometimes. That could be a problem on the Oasis.