Link to events form is gone

Hello friends,

for some reason my link to the events form does not work anymore. I did put the link into a button like this: a href=”/add-listing/?listing_type=gd_event” but when you click it for some reason you get straight to the homepage / startpage instead of getting to the form, like it was before.

Would you please be so kind and take a look at my page?

Thank you,
Atilla