This question got me thinking that it would it would be cool to have a full screen calendar on a home page. So I did some looking around. I found
aCalendar that was mentioned above. It is pretty cool. But the free version only does a week in full screen with a full month in the bottom corner. Not bad. The paid version supposedly does a full screen month, but I have not tried that out.
I also found
Julls' Calendar it
does do full screen and I am liking it. I will probably keep it by itself on a home screen.
OP did not mention what functionality he was seeking along with being able to do full screen. Julls' Calendar is real basic. Just a calendar that you can swipe over to for a quick reference. aCalendar seems to be more richly featured and seems to synch with the native calendar.
Anyone know of any others?