There should be a serverless function that registers when a certain even will end. If the next event is free, then the user will be prompted to prolong his current event, start one of the initial ones, or start something new.

There should be a stop button in the calendar that can either mark the current event as resolved start the next event and schedule it after.

For now a pie chart with the calendars, time spend between events with the same name and free time and at least one more should be OK.

Commonly used events should be save and every time they occure it should be added as time to the saved templates.

The event templates should accumolate data of how many hours the user has spend doing them for which days. The user should be able to choose for what period to see his data and also delete periods

Add privacy policy and terms of service

The user need to confirm his schedule. He needs to click a button which will show in a modal, displaying how his time is spread (maybe another page is there is not enough space).