From the airport Praha Ruzyne to the Conference Venue Novotného lávka, 5:
Go by a bus No. 119 to the terminal near the underground station “Nádraží Veleslavín”. From here take underground to the station “Staromestská”.
You will need only one ticket per one person (32 CZK) for the bus and underground together (buy in a ticket-machine in the airport); it is valid
for 90 min. When entering a bus you have to validate the ticket. From “Staromeststká” underground station it is a 200 m-walk (follow the map presented below).
From Praha - Hlavní nádraží (Main railway station) to the Conference Venue Novotného lávka, 5: Go by a underground (line C) to Muzeum station. Here change to underground line A to "Staromestská" station. From here you walk as written above.
Official website of Praguecity: