There is a parking lot, but it&;s really hard to park on Saturday and Sunday. I went on Sunday. I should have gone from the south gate to the north gate. There is no parking space in the parking lot. Find a parking space at the Vienna Hotel near the north gate. Parking fees are not cheap anyway. It takes a little distance to walk.
Therefore, if you travel on Saturday and Sunday, I suggest taking a taxi if you can. Parking spaces are really hard to find. If you park far away, you will be tired to walk.