*Reply from Anonymous from the Events Manager support forum*
"ok, I get why it happens, but you’d need to do some tweaking/digging yourself. I’ll explain, theres two different reasons for each one:
I just tested this out on my test server (nifty plugin! may make it into the demo) and it works, I’m wondering if it’s to do with your theme or another plugin. There shouldn’t be a difference between how locations and events pages are rendered.
I’ve partially fixed the issue, if you visit events-manager/classes/em-category-taxonomy.php line 20 and replace it with:
add_filter('the_content', array('EM_Category_Taxonomy','the_content'), 9);
the button shows up, but for me it doesn’t actually work when clicked on. I’d have to spend some time digging into the plugin further and am not able to atm.
the problem must lie in the fact that this page is an archive which we turned into a WP page during template redirect and the pdf plugin gets confused somehow, how exactly is the question. I tried adding the button manally and still no dice."