At Niushikou Station (not far from Carrefour), take bus No.304 to the South Railway Station, which is under the overpass. There are many buses to the new exhibition, such as 102. You can ask the driver, because if there is a large exhibition in the new exhibition, there will be more buses there, and cars that don't usually go there will also earn some extra money. If it's fast, it only takes 20 to 30 minutes from 304 to South Railway Station. It's about 12 stop. It takes about 20 minutes from the South Railway Station overpass to the new exhibition. It depends on how fast the driver drives. I've been there before, and the driver didn't stop during the shortcut. It only took a few minutes to get there.
If classes are suspended, 304 and 102 will close earlier and at 7 pm. If you want to go, you should calculate the time.
I hope I can help you ~