Hi! I've seen your requirements, I m interested in developing this portal, I have highest reviews for jQuery (frontend) at freelancer.com, and have expertise in developing responsive templates based on HTML5, CSS3, Client side(JQuery Prototype) and PHP(cakephp,CI,Zend) for Server side.
Let me know the nature of business and some similar site links if u r interested in my bid
Features:
Site with proper CMS in adminpanel, Easy management of Events in adminpanel, Multi-language option,Your design would be highly responsive, it will fit perfectly fine within mobile, tablets and web.