Evening and part-time openings around Knoxville after 8 years as a teaching assistant

I am looking for part-time work that fits around school hours and found a few evening shifts near Knoxville. I have read a lot of threads here and could not find my exact situation. They can give a schedule two weeks ahead. Is the schedule really fixed?

I got the job by going in around mid-morning and asking for the manager. Worth a try.