Plan to land your car on the upper deck, near the clock tower.
Event will last 88 minutes, then we're "outatime".
6:01 PM - Meet for photo op at clock tower. If you arrive late, try to get your own pic to share in your log.
6:11 PM - We'll go inside for food and socializing.
7:29 PM - Welcome Marty and crew to 2015!
Of course, they arrive / arrived / will arrive in California (Pacific Time), so that will be 7:29 pm Eastern.
Thanks to Biff "Awesnap" Tannen for the inspiration for some of the aspects of this cache page. He is hosting Great Scott! It's Future Day! concurrently with this one down in Alexandria.