Holy shit. This is probably the biggest Holo convention venue yet. Minimum seating arrangement is about 1500 and it can go all the way up to 4000. For comparison the other Holo panel convention venues were 1000 at best.
Sources:
https://www.crunchyrollexpo.com/ (scroll down for map)
https://73r4.com/TSJ (SJ CONV CTR -> PARKWAY STREET LEVEL -> GRAND BALLROOM)