The public is welcome - and this is a free show! However, because Lincoln Labs is located on Air Force land you must show a valid driver's license to get in. And if you're not a US citizen then have your passport and green card or whatever documentation you need. Address is 244 Wood St. Lexington. Plan to arrive 15 minutes early to deal with getting in. Guard will show you where visitor's lot is - just tell them you're coming to concert.