Bus number 3 from the main train and bus stations goes directly to the conference site. This bus runs frequently and also makes many stops around the city center. Get off the bus at the "Jihočeská univerzita" (University of South Bohemia) stop and cross the street. The conference site in in Building C of the university, which is to the west (or to the left when you cross the street) of the Biology Center.
The 3 bus stop at the train and bus stations is directly in front of the Mercury shopping center, whose roof serves as the bus station, and faces the train station/tracks. This bus stop is accessed from the train station via the pedestrian tunnel.
Bus tickets are 13 Kč and are obtained from yellow ticket machines or tobacco stands.
More information about buses around České Budějovice can be found
here.
