The conference rate is no longer available for the Wednesday night and for the Friday and beyond. There are plenty of rooms in the block available for just Thursday. You can book a room for Thursday HERE.
If you want to stay multiple nights, you can book at the Golf Resort for the same rate ($239 plus tax) and should contact Steven to do so:
Group Reservations Coordinator
The Ritz-Carlton Resorts of Naples
Naples, FL 34108 USA
Direct: +1 239.514.6051