A core function missing is the ability to disable a routine/ daily 
occurrence for a specific day. For example, I usually exercise from 6pm to 
8pm every day, so I created an event that happens every Monday to Friday. 
Today is a Thursday and due to an unexpected occurrence, I can't exercise 
today. I wanted to change that my 6-8pm block of time just today, but can 
only do so by deleting the event for EVERY Monday to Thursday to clear my 
timeline. Makes no sense to clear that block of time and need to re-create 
that exercise block for all the other Monday to Fridays. If something 
unexpected happens at 6pm next Friday, I'll have to delete it ALLL, and 
recreate all over again after just to clear my timeline. If you get this 
core feature right, then the app would be complete.