National Dive Bar Day is sponsored by Seagram’s Seven Crown because 7 and 7 is a classic dive bar drink.
Definitions vary as to what a dive bar is. Dive bars are generally considered to be dingy, working-class bars, although people from all social stratifications are welcome to frequent them. The term shouldn’t be overused: not every single small bar is a dive bar, and many bars that aren’t dives are wrongly labeled as such.
One of my favorite dive bars is Big Sam’s at Rudee Inlet in Virginia Beach. Although I would not personally qualify it as a dive bar, I have a t-shirt that disagrees with me.