I am in the same boat about forgetting appointments.
aCalendar is what I use for years and I like to say, it is the best calendar.
I mention to you just one function: To copy an entry is as simple as it gets and so I you keep your history, instead of moving an entry. It also offers to create several entries, instead of a series.
http://play.google.com/store/apps/details?id=org.withouthat.acalendar
The website for more information: http://acalendar.tapirapps.de
Not synced with Google, I created a calendar that is as private as it gets. So I have to make backups. Backup your calendar with: iCal Import/Export CalDAV
http://play.google.com/store/apps/details?id=tk.drlue.icalimportexport.premium
The Website: http://ical.drlue.at/
To support the developer I had to get the Pro Version, now it runs automated backups. Very useful app for me.
My two cents to your show.
Br,
Reto
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