Page 132 of Give Praise to God makes a great observation when it states "Our services can be properly sensitive and friendly to non-Christians without calibrating everything to the level of a first-time visitor." I have always seen evangelistic events as being totally separate from the sermons that are for building up the body of Christ. Certain sermons were just expected not to apply to me, because they were geared for the lost (i.e., Easter morning and Christmas), and certain sermons would be over the head of someone who had just walked in for the first time that day. But if the whole Bible points to the Gospel, it's not hard to give the Gospel when you are teaching Bible passages the way they were intended to be interpreted. Likewise, focusing on the Gospel is indispensable for every believer.