Hi graphicaa, I noticed your profile and would like to offer you my project.
I want to have a website in which users can log in to their accounts and create sport events (football, basketball, etc.) by inputting some information (date, time, place, etc.). After creating an event, they can invite their friends and they can respond to that event. Also if the user cannot find enough number of players among his/her friends, he/she can publish an ad (saying I will give 10 USD for participation) to find more players. Also the user searches for an event and can join as well.
To summarize, this website will be a place for easy and fast sport organizing.
I can provide you more detail once we have a deal.