Depends how late. Kirby Lane as already said, good mix of diner and Tex Mex. A handful of great taco spots open late.
I’ve done about every late night spot in Denver for post 2am food. One of my favorite now defunct places was called Mary Jane’s Pizza. They were open from 11pm to 4:20am and hung signed pizza boxes from all of the bands and entertainers that made it a regular haunt.
What is the go to post-gig food spot in your neck of the woods?
Western PA back in the day. After-hours we headed for "Winky's" in Connellsville. While visiting my son, we went to Eat 'n Park (Slurp 'n Burp) and, yes, we got the "smiley" cookies.
In Norfolk, we avoid the Waffle House as it's a hang-out for the ho's, gang bangers, and drug dealers. Apparently, a waffle combo complements any 8-ball. WaWa is the safer bet as there's usually 2-3 police cruisers in the lot.
Riis
Back when I lived in Pennsylvania it was either Sheetz or WaWa, or maybe Eat n' Park.
LA it was In and Out.
Seattle had a bunch of all night coffee joints.
In Nola, there's a local place called Buffas in my neighborhood.
None of the good spots we used to hit are open late enough since the pandemic hit. They all scaled back their hours.
So in Houston , Tx. , it's pretty much Wataburger or Denny's.
EDIT: And Waffle House
In & Out is my after gig stop. It's the only thing open other than McD.