Sometimes, scheduling makes life easier people with autism. Unfortunately, disorganization and changes in plans can overwhelm people autism, but they must learn how to cope with these changes (not all changes are bad! be flexible!). Another strategy is use a special system to organize schedules like shelving books alphabetically and numerically.
Tip: Think of a back-up plan in case there any change occurs. That would shuffle your schedules. Shake the whole thing up.