Repair, Modify PHP Event Registration System

I am looking for a very proficient PHP coder to repair an existing event registration system that is currently not entirely reliable. In addition, I want it reconfigured so in the future it can be integrated into a redesigned version of the present website. The existing reg system can be seen at www.calcapsummit.com. If you click on the text link in the writeup on the Home page, you will see the correct entry point to the reg system. However, if you click on the "Register" button in the menu bar, you may see only a horizontal rule under the header. If you click the menu button a second time, you should see the correct entry point. This may be the result of a fault in the menu system, or in the PHP code. One part of the project is to figure that out, and recommend a fix. The existing files can be viewed at [login to view URL] I have renamed "[login to view URL]" to "[login to view URL]" so it does not block a directory listing of the folder. Currently the PHP files generate the entire page of the reg form, including the header and nav bar. If possible, I would like the PHP files to display the form within an HTML page, so the header and nav bar are handled outside of the PHP files. In the future, we may switch the site to use Wordpress as a CMS. I would like the PHP files configured so they can be integrated into a Wordpress site. Thus if you have familiarity with Wordpress, that would be a plus. The timeframe to complete and test this project is three weeks.