Tresdecu, welcome to the NW, I live in Woodinville.
When I became a JW in the seventies, the big conventions were held in the Kingdome (which doesn't exist anymore). Typically about 50,000 people attended. Then they went to the Tacoma dome, with about 10,000 attending each of two or three conventions. So going to the assembly hall is just another data point in the downward slide.