Event Calendar Registration system

We are developing an online Event Calendar Registration system where customer can select an Event they would like to attend and pay for it via payPal and receive confirmation via email. See: [login to view URL] We segregate the project into 2 area. Area1: Event Calendar. We are looking for the following 6 step process development which is in PHP. 6 Steps involve to the process. Step 1: Select an Event Step 2: Go to Event Description. Step 3: Registar form for Event. Step 4: Calculate # of participants. Step 5: Payment goes to Paypal. Step 6: Registration Confirmation email Area 2: Admin Admin can create / edit / delete / Events View: Participants, reports and all sort of reports. Seats: Auto calculates # of available seats Event: Price can be configurable by admin. Promo code option is required.