Alan,
Regular Registration Check-in & Tech inspection is Friday evening 5pm to 9pm at the event site, in the Paddock area. The welcome party will be there also.
Late registration & Tech will be Saturday morning from 7am to 8am.
Impound will be in your assigned Grid position after you make your runs during the event on Saturday & Sunday.
The Test-N Tune is Friday on the same area as the weekend's course is & is from Noon to 3pm. You must first have Tech Inspection in the Paddock area across from the Bus Lot, before you can run the Test-N-Tune. Only 1 Tech Inspection is required for the whole weekend. If you get Teched for the Test-N-Tune, you're good for the whole weekend.
Basically the Test-N-Tune is to let you adjust your car a bit (tire preasures & so forth) & let you get used to the characteristics of the Bus Lot. .....or to just have some fun on a Friday afternoon!
Let me know if you have any more questions!
Brad