Task / Lesson Planner

I have been using sunbird to try to plan my lessons. Its not working as I would like. What I am looking for is the ability to plan out task or lessons that can be easily moved. For example if I have a test scheduled for friday and on wednesday there was a lock down and students did nto recieve instruction I can move the entire unit down one day. As it goes now I most manually move all my task back on day. However I do like the ability to have 6 different calenders I currenlty teach 6 different classes so scheduling is very important.