Contact button on event's details!

Hi Tuan

I would like to give the ability to my visitors to contact with the creators of events, to ask them, whateverything they want about the event.
An easy way is to insert a "contact" button on the end of event.
Actually, to make a fourth button, there where is now the buttons of, Register (individual), Register (Group), Invite Friend.
and when someone clik the button Contact, to appear a pop up window or something else with a simple contact form.

You think, is easy to make it?
Look at here -> goo.gl/D3YdiJ The third button is a contact form

You will need to edit the code to add the button yourself. The file for editing code is components/com_eventbooking/views/tmpl/default.php

Regards,

Tuan