I used to use a pocketbook calendar exclusively. But as the girls got older, I found that they were asking about this or that activity and I was having to pull out the calendar several times a day.
Mike suggest that I get a couple of write-on-wipe-off calendars for the refrigerator.
This has simplified life so much. You can't really tell the size of them in the picture but I'd guess they are about 11"X14". Not teeny. And I keep track of so *much* with these. Even down to changing the central air filter and checking the plants for water.
I still keep my pocketbook calendar to note things when I'm out, but I transfer it to the refrigerator calendar when I get home.
When this month is over, I'll erase the January board, move February to the top and then fill in March on the old January board.
I spend approximately 5-10 minutes a month on this. It really helps to keep my family organized.