I have many colleagues who schedule an "Instructed Eucharist" once a year. I hate that and have never had the desire to do it. There are several reasons: 1) it takes more than one week to cover this topic thoroughly 2) you don't know until 4 minutes after the service starts who is going to be there 3) it is generally horrendously boring, if done competently, and most people check out after the first 10 minutes because they don't care.
That's not to say it's not an important subject: it is. Better for a Sunday school or small group format though. Then you are more likely to get the group that is truly interested or at least willing to listen. You can break it up into manageable portions and be thorough. Also, there's more in the service book than the Communion service.