A new office building in Osaka, Japan, has the largest passenger elevators in that country. Each of the five elevators at the Umeda Hankyu Building:
[...] can each carry up to 80 passengers, or 5,250 kilograms in load. The interior of each car is 3.4m wide, 2.8m long and 2.6m high, with a floor space of 9.52 square meters.
Link via Popular Science | Photo: Mitsubishi Electric
Start the meeting, push your respective "floors", then get out after you've presented your report.
Let's say, 12 persons, 12 chairs and a long table, plus tech equipment as needed. (Better than 80 overweight Americans.)