When viewing the Calendar in month mode, I find that a there a number of appts on the day, which is not always visible, but adding another evening to the day on "month view" leaves little space with the cursor to add an event at the bottome of day.
I know that i can just go into day mode and add it, but for me personally having a PLUS + next to the number (day) would be faster and more efficient.

Also if you were able to add your location and have the weather temp/sun or rain etc on the day in the background would be nice.