Opava is best reached by train, usually with the change at Ostrava-Svinov. The train connections can be found using this web site  (there you can click on the British flag in the lower right part of the page to switch to the English language interface). The main train station of Opava is called Opava východ.

For the path from the train station Opava východ to the Mathematical Institute building (the workshop venue) please check this map, while for the path from the Institute to the Iberia hotel (the conference party location) please see here.

For a map of Opava city center, please see e.g. here.