Playhouse Seat Reservation System

I need a seat reservation system for a community theater. We are small and our guests come free, so our budget is really small for this. Once the software is created, you are welcome to either reuse it or release it open source. Here is what we need: 1. User clicks link on website to enter reservation system 2. User selects event that shows event datetime & name 3. User is presented with a seating chart 4. Seating chart has green for available or red for reserved 5. User selects seats and clicks reserve 5. User is asked to either login or register 6. Opens form to get user's username, password, first name, last name, email, and phone 7. Once user inputs data, seat is reserved for that event 8. Or user logged in with previous id and reserved seat Admin Panel: 1. Need a way to add, change, delete events 2. Need to see reservations by event 3. Also need a way to pull info about users...putting it in a csv would work