Online calendar

we are looking to rewrite our calendar solution from ASP to PHP. This project will include full administration for the Group administrator and the ability for members of the group to move events from the Group's Calendar to each members personal calendar. Individuals will also have the ability to add/remove events from his personal calendar. There are other features but will need to discuss in person. YOU MUST HAVE EXPERIENCE WITH CALENDARS AND BE ABLE TO SHOW EXAMPLES OF YOUR WORK. I WILL NOT REGISTER TO ANY SITES ... YOU MUST PROVIDE URL ADDRESS AND USERNAME AND PASSWORD TO SHOW YOUR WORK.