I live in Laconia, about 10 minutes from Gunstock. I have plenty of parking and could work something out with shuttling.
A family member, visiting this past weekend, is also in the event. She asked if she could park at the house and cab over to Gunstock as she too thinks parking at the race track is absurd, especially if you're staying near the lake. I told her she could park here and I could shuttle them back and forth depending on the times. Maybe I can help others?
