In the Calendar section, using the 'week' view, it does not show all-day appointments. You must scroll up to see them!
Show all-day appointments in the top row, just like the weather.
Detailed description: The default calendar view for the week shows appointments from 8am to 6pm -- all-day appointments aren't shown! You need to scroll up to the top (unlikely) to see things like holidays, birthdays, vacation days, etc.
Fix: Lock the top row like every other calendar program (e.g. Google Calendar) to show the all-day event so it's not part of the scrolling grid. Display it always just like the weather.