I bet you already have an idea in your mind on which spot this might be, because I know I did. It's also one of my favorites, so I'm glad it's getting the recognition it deserves.
Here's a hint: everybody (in Portland at least), knows exactly what restaurant you're talking about when you see these legendary lights.
Literally the world's largest taco tour festival admission is free, and it's in Manchester with more than 70 restaurants involved in the crazy, unique, or simply perfect taco.