Going to White Flint Mall with my mom shortly after it opened. I thought the glass elevator inside was so cool- just like the elevator in "The Towering Inferno."
Record World at White Flint. They had a whole wall of 45" records. I specifically remember buying a copy of Hall & Oates' "Maneater" there- early 80's
The cheesy commercials for Dick Steven's Chevrolet in Wheaton. I found some of them on Youtube:
https://www.youtube.com/watch?v=onMXzujXiDQ
Theater Vision commercial with Joe Jacoby & Mark May:
https://www.youtube.com/watch?v=HeXHXoNPZj4
Shredder's Surf Shop at Wheaton Plaza
The Sunshine House surf shop at Lakeforest Mall
The County Seat
When "To Fly", the first IMAX film opened at the Air & Space Museum
When my high school (Sherwood High, Sandy Spring MD) gave students an excused absence to attend the Redskins SuperBowl parade in 1988 (my senior year in HS). And some of us actually did go downtown to see the parade.