The built-in calendar app on Nexus 7 is insufficient and lack of certain desired features. After searching for alternatives in Google Play, I find some better Android calendar apps/widgets for the Nexus 7 tablet.
* Business Calendar (Appgenix Software) is a complete calendar app that is synchronising with any number of Google calendars. It offers multiple views, search events function, scroll- and zoomable multi-day view. You can also use its widget for showing different details across various date ranges.
* Agenda Widget make it easy to view your events and tasks on the homescreen. It interacts with Exchange. But when I go to customize, it keeps crashing.
* CalWidget (egg 'n stone) is a Calendar Widget whcih shows as many events as possible. It is not interactive, because you have to add, remove, and edit appointments within the built-in calendar app.