up to 24 hours before the experience starts (local time)
Right across from Starbucks and Hard Rock Cafe, right by the 'Gaslamp Quarter' sign and the Convention Center. There are two parking garages close by: 6th & K Garage and the Convention Center Parking Garage. There is also street parking, but it can be very competitive.
You can cancel up to 24 hours in advance of the experience for a full refund.