You're right. I'll bet a LOT of attendees will need the street address to get a personalized map:
It's --
Santa Clara County Fairgrounds
334 Tully Road
San Jose, California 95111-1913
Tully Road exits off of Highway 101 and it seems like the fairgrounds are about 2 miles in on the valley side from the freeway (i.e. towards the town and away from the circling hills...)
Parking is across the street from the fairgrounds and usually also adjacent to the grounds. Parking is typically less than $10/car ... it seems like it's usually $7 or $8 but my memory's a bit foggy tonight.