The main detected problems that appeared on websites all across the EU enabling online purchase of tickets to cultural and sporting events were unfair provisions in terms and conditions and missing or misleading information about prices or about traders. 

In the Czech Republic, the Czech Trade Inspection Authority carried out checks of totally eleven web pages offering tickets for cultural and sporting events online. In three of them, suspicion concerning incomplete consumer information appeared; however, in all cases all defects were corrected by the traders. 

Also the Permanent Representation of the Czech Republic to the EU informed about the action in detail (in Czech):

http://www.mzv.cz/representation_brussels/cz/evropska_unie/vnitrni_trh_eu/nakupovani_vstupenek_na_siti_je.html

Information is available also at the website of the European Commission (in Czech):