Yes. Please click the red banner at the bottom of the Event Page which will display any available Camping, Parking and Bus tickets. This will allow you to purchase the add-on tickets separately, without purchasing a new event ticket.
Please note- You must currently hold a valid 3 Day Event ticket in order to purchase add-ons separately. Moshtix reserves the right to cancel any add-on tickets if you have not purchased a 3 Day Event ticket.