Timetable can be found on:
From the Main Station in Sosnowiec you can reach Expo Silesia by the following KZK GOP city bus lines: 55, 690, 808, 811 and 902N. If you click on the following links you will find the timetables for these bus routes with departure times from Sosnowiec Dworzec PKP (Sosnowiec PKP Station bus stop):
From D±browa Górnicza station you need to go to the bus stop in the Centre of D±browa Górnicza (about 7 minutes by foot), catch bus 182 and get off at the second stop. Here is the timetable for line 182 from the D±browa Górnicza Centrum (D±browa Górnicza Centre) bus stop.
Those who arrive to Katowice by train should go from the Train Station to the bus stop located at ul. Piotra Skargi (about 6 minutes by foot) and catch a bus 811 towards Tworzeń Huta Katowice (Gołonóg Zajezdnia). You need to get off at the 10th stop, Zagórze Expo Silesia. On this link you can find the timetable for line 811 from the Katowice Piotra Skargi bus stop.