That is like finding a needle in a haystack;
1.) First you need to have an account on Ebay, so if you do not already, create one with your e-mail address and a password (don't worry, you will get NO junk mail because of this as Ebay protects their e-mail addresses.)
2.) Second, then do a search on Ebay using this exact phrase (no more, no less):
Sportsman's Park Program 1981
When you get the results it will say under the search box: 0 results for Sportsman's Park Program 1981 and then there will be a heart and it will say Save This Search. Press on Save This Search.
It will then e-mail to you anytime there are search results which include Sportsman's Park Program 1981 and you can check to see if they have the exact date you are seeking.
The reason to not add the exact date to your saved search is that someone may list a lot of 1981 Sportsman's Park programs and if your date is not in the title of that listing (and you listed a specific date) it will NOT e-mail to you.
Good Luck!! There ARE about 50 different Sportsman's Park programs listed, but not the one you seek.