Form doesn't seem to be working

Hi I have a form published but when people use it, they keep saying it's not working, have I done something wrong?  

It's a very important form as it's for booking in traders for a large charity event

I tested your form and I didn't see any errors:

But maybe there is a problem in how the form is embedded. Could you please share the URL where your form is embedded so we can have a closer look.

We'll wait for your response.

thank you!