Coming across the term midway in a sense I was unfamiliar with, I checked OED, and, sure enough:
3. N. Amer. (At an exhibition, fair, etc.) a central avenue along which the chief exhibits or amusements are placed; any area of sideshows or amusements; (slang) a hall. Freq. with capital initial and with the.
The use originated in the inclusion of the ‘Midway Plaisance’ of Chicago in the grounds of the exposition held there in 1893.
Running my eye down the cites, I noted this one:
1956 H. GOLD Man who was not with It i. 3 There he is on the midway, Grack the Frenchie, talking for his countstore.
OED returns no results for countstore; Google no useful results. I can only assume it’s some kind of sideshow. Does anybody know?
Edit: I seem to recall that there was a scifi author named Gold, and I wondered whether this was he and the term merely an SF nonce-word. But apparently not. This is the author in question, and he’s not the science fiction writer (if indeed there be one).