I don't know if this counts as a GT40 Event, but there will be a GT40 (1030) at The Boston Cup, a classic car show, on Sunday, September 22nd on the Boston Common starting at 9am. The awards ceremony starts at 2pm.
The Boston Cup - Boston's Premier Classic Car Show
It's free for the public to view the cars, but you can buy an "Inner Circle" ticket to get in closer to cars.
If you want to see some of the cars that will be on display, visit their Facebook page.
https://www.facebook.com/pages/The-Boston-Cup/145250372151691
You can see pictures of last year's cars at:
Boston Cup Classic Car Show 2012 - Photos, Results and Report
The Boston Cup - Boston's Premier Classic Car Show
It's free for the public to view the cars, but you can buy an "Inner Circle" ticket to get in closer to cars.
If you want to see some of the cars that will be on display, visit their Facebook page.
https://www.facebook.com/pages/The-Boston-Cup/145250372151691
You can see pictures of last year's cars at:
Boston Cup Classic Car Show 2012 - Photos, Results and Report