Looking for already made software for a particular type of site

[Siddharta]

I have this idea for a site to publish social events such as concerts, parties and things of that nature in banners on the home page and where users can register to invite their own registered friends to their parties that they can privately or publicly post, it should also have photo and video albums for the events and for the users to post their videos and pictures. That's about all I can come up with right now but that's the main idea. I can�t design the site myself because I'm just getting started on web design and have no idea on how to proceed, I have someone who'll help but it's too big a task for her too. I'm just looking for something I can just buy and modify to my needs but I have no clue as to what this type of software is called, how I should look for it. Well, that's about it.

[alvo]

Try Hot Scripts and either look in the PHP categories or the Remotely Hosted categories.