Finding similar application

I have little problem and i hope that u help me. My teacher gived me the task for my project. I have to find similar web application to mine subject, and my subject is: "Free time organizer". It will be application which gives u information about event in your city and u can plan u free time just like in organizer. What's more u will be able to create group events and ivite friends. I know its nothin original but i really cant find anything similar on Google. I would be grateful if u could send me some links or name of similar apps.