We build our website with you template. We are optimising the result but we face a lot of W3C errors.
Your own demo site has a lot of them. Example;
https://demo.gavick.com/joomla25/events/index.php/template/pages/articles/single-article
Just a single article has 3 W3C errors.
Most of them cannot be solved in the backend, but the PHP needs to be modified.
Do you have plans to make your templates W3C compliant?