1635 Promontory, Cedar Hill, Texas. You can get to Cedar Hill via I35 to Hwy 67. Take the Beltline exit and head west (turn right). After you pass the fire station and the tall radio towers, look for the ninth grade center school on the right side of the road. After passing this school, turn right at the next traffic light. Proceed to the first street on the right and turn down Mobley (if you go down a really steep hill, you went too far). Follow Mobley until you see a gate community on your left with a red brick wall with the name Promontory and an exit gate and an entrance gate. The entrance gate should be open by 6:00 pm on the day of the event. Proceed to the end of the street and go down the driveway that is directly ahead and has a large gate (it should also be open. If you look at a Google Map, it will name the driveway as Tango Trail (it is only a driveway). Look to your left as you travel down the driveway and you will see a large house facing the driveway. You are there! Google Map below.
You can also get to Beltline off of I20 by taking the Beltline/FM 1382 exit and head south. After you pass the state park and the Newman Academy, the second light will be Sleepy Hollow, turn right and climb the hill until you hit Beltline. Turn right and follow above directions.