In addition the main show on the lake, there is some sort of ceramics trail through town and also some exhibits of award-winning ceramics.
We got there right at 10 and the place was packed by 11. There didn't seem to be any admission charge.
Therewere a couple of big parking lots set up on the outskirts of town with bus service to the fair -- looked like the fee as 3.50 . Apparently they also have extra boats running across the lake from Herrsching. We went to Herrsching later in the day and the place was deserted except for the big line for the boat!
ps -- We did make it to the church as well -- the Marienmünster is truly stunning.