Sweet and Viola make the point in their book, Jesus Manifesto, that church is for the purpose of corporate expression of Christ. The thing I like about this thought is that this can be realized within our morning assembly and our every day. It doesn't have to be met exclusively in either place. The other thing is that is about the community, the people, not the individual.
We are to come together on Sunday and be an expression of what Christ has done, is doing, and can do through us and in spite of us. Sometimes that will include singing, prayer, teaching, and giving. Other times it should include testimonies, sharing a meal, baptism, confession, and even silence. If we are truly the expression of Christ then Sunday becomes something where we not only express and praise Jesus, but are engaged with one another in such a special way that we are led to continue that expression throughout the week.
Our communal or corporate expression throughout the week doesn't necessarily mean that we come back together in one place, although it could. It means that there is an understanding that we are all being the expression of Christ all week long and taking our experience of that to share in encouragement on the following Sunday and bind together through the power of the Holy Spirit.
Bottom Line: If we aren't coming together to be the expression of Christ and continue that expression throughout the week, then maybe we left our head (Jesus) somewhere else.