Getting number of wall posts on an event page

Getting number of wall posts on an event page

first time using facebook API. I was wondering how I could get the number
of wall posts for a facebook event page so I can display it next to a link
on my page. The only thing I could find is:
SELECT comment_count FROM link_stat WHERE
url="https://www.facebook.com/events/579589685427085"
Which is only return 0 even though there are posts on that wall