At one level, this shouldn’t be a hard question… surely you design your meetings for the people who are meeting with you.
So, since the meeting is for everyone – especially Christians (see the last post) – you have to think about the different types of people in the room, and there’s really only two types of people: people who are not Christians who need to hear the gospel, and people who are Christians who need to hear the gospel.
So proclaim the gospel. Proclaim it in the welcome, in the songs, in the reading, in the sermon, in the prayers, in the invitation to hang around for supper. Christian or not, they need to hear it and be reminded of it.
But, since the gospel is the power to save from God’s eternal wrath, there’s a right priority to make the most of the opportunity afforded by the non-Christian in the room. Don’t do everything for them, but don’t ignore them as though they’re not meant to be there… they are meant to be there! They just don’t know it yet.