EXIT sign above the 'closed' stairs was still illuminated, beckoning all to "come-hither".
I look over the railing back towards the bottom of the staircase, and I see that the club has cordoned-off what was the main entrance to the club, and a band is loading-in their stuff. The usual junk is piled every which-way: drums, speakers, guitars, mic stands, road cases . . .
Huh? I look again, a sure enough, my eyes are not fooling me, they have removed the host stand and they are using the main entrance to the club as the stage. I can see the glowing red EXIT signs over the doors. I look around upstairs and I do find another exit, although it's not well-marked. So this means that 1/2 the upper balcony audience may have to go down the other stairs, and 1/2 may have to find their way out through the adjacent bar area (again - the EXIT sign in the adjacent bar area is NOT visible from the show room balcony seating area).
Next, I go downstairs to get a better look. Once there, I see that at the bottom of the 'closed' staircase (which ended right at one of the two front doors), they had amplifiers and junk stacked in the travel path. So I look around some more. To the other side of the other main entrance / exit door there was a doorway that went into a souvenir shop at the time I came in to dine. The souvenir shop had another exit door to the street, but now it was closed-off and inaccessible. I moved away from the band's makeshift performance area and I found a passage out to anther adjacent part of the bar, it has an EXIT sign, but the lamps are burned-out, and the passage is circuitous and poorly illuminated.
I follow that passage into the adjacent bar chamber, and I can see two possible egress routes. One has a vestibule with another door leading to the outside, but the EXIT sign for this door is only visible to about 1/2 of the room, or less. I walk closer to this exit door and gradually the overhanging soffit that forms the vestibule area around the door reveals that there is an EXIT sign above the door. Mystery solved!
Final count: One functional exterior EXIT from upstairs (sign not visible from the balcony audience area), Two functional exterior EXITS from downstairs (one of which the sign is mostly obscured, neither of which are visible from the central audience area for the make-shift stage).
This means that a space that had SIX exits during the day (a light density crowd, mostly people dining) when the Fire Marshal visited and there was a lot of outside light filling the space through the windows; and only had THREE working exits at night when the patrons are highly inebriated and more densely packed. All this on a Friday night in a college town . . .