They also take up a lot less space than programs or yearbooks. You should have a fairly easy time piecing together the Bronx Zoo schedules. Here are some of mine:
I've had this one since 1976 and even marked the game that I went to, my 1st Yankees game in person:
Got these out of Sterling a year or so ago:
I bought this one quite some time ago for my O'Doul collection:
Bought this one earlier this year; loved the graphics:
how about pocket calendars? Here is a Vitali Klitschko one for his Ukrainian political party. Eastern European politicians haven't learned to fake-smile yet; they all look like they've been arrested: