Keeping on schedule....  what a concept.  I am a fly by the seat of your pants, that sounds like fun woman.  This works well a lot of time with a well developed lesson plan/schedule.  However it all falls apart when I have fewer children to teach.  It feels then like I have unlimited time to work with, which we don't.  Things fall apart, things (sometimes important things) get forgotten.

Therefore:  it is my opinion and my experience that it is vital that we follow our class schedule/lesson time even if we only have one child.  Then that particular child gets the best day ever with total individualized attention and nothing he/she needs gets missed.  When we throw out the schedule because of fewer children it is that much more difficult to get back on task when all children attend.