The most convenient mean of transport in Slovakia is train (especially IC trains). On the webpage www.cp.sk you can find connections between all Slovak cities and the conference venue (GPS 49°9'5.66"N 20°17'13.64"E) Stará Lesná.
Here you can find a selected list of trains and buses to Poprad-Tatry on July 3.
In case you need any help concerning arrival to conference, don't hesitate to contact conference organizers