In the late 1960's ( I started associating with JW's in 1968 ) and early 1970's......the Circuit Assembly was usually in a rented high school auditorium. In those days, I kind of enjoyed the closeness of the experience here in western PA. Some school auditoriums were better than others. Then our assembly hall was built in 1976. It was fun then too because we had a great kitchen and dining room and lots of good food. And of course, like many others here, I bought into the whole JW lifestyle hook, line and sinker. You all know what has happened since!
As far as the big district conventions go .........my choice for the worst was the Richfield Colluseum near Cleveland, Ohio. It had bleacher seats and the whole place just sucked. I don't think it exists anymore.
Second place for worst was the Laurel Maryland horse race track in 1976. The only thing I found enjoyable there was watching the horses with their trainers through the huge windows in the building.
Third place for worst is the Convocation Center in Cleveland, Ohio where the conventions are still being held since about 1990. The last one I attended was in 1996.
The places I liked the best was the Wheeling, West Virginia Civic Center back in the 1980's and of course the conventions that were in Three Rivers Stadium in Pittsburgh in the 1970's.