My weekly schedule for my classroom is as follows:
Monday - Notes day
Tuesday & Wednesday - Centers
Thursday & Friday - Computer lab
Any time that I deviate from this weekly schedule because of teacher work days, holidays, etc I let my students know in advanced. This helps create a climate in which students are comfortable because there isn't any guessing when it comes to what kind of activity we are completing that day.
I do have more flexibility with how I structure my week, being that I teach a remedial math "connections" or "specials" class. However, I do think that you can achieve this in the regular classroom as well.
How do you structure your class?
What are your thoughts on keeping to a strict schedule every week?