There are two ways to customize the calendar events:
Just type them in using Microsoft Word. This will do in a pinch, I guess.
Use Google Calendar. This way is the best.
So, to get started, create or sign in to your free Google Calendar account. Then authorize for BeauCal.com. Follow the prompts & get a success message. Finally, your Google Calendar events will be included when generating calendars on BeauCal.com.
I hope that helps,