Illegal merchandise has been seized from outside a Jess Glynne concert at ACC Liverpool at the weekend.
City council licensing officers and Merseyside Police carried out an operation which saw about £600 worth of t-shirts, and other goods taken from unlicensed traders.
A vendor will be summonsed for street trading offences and a court order sought to dispose of the goods
Councillor Frank Hont, cabinet member, said: “The seizure of these items sends out a message to unlicensed traders that their activities will not be tolerated.
“They hit at legitimate traders and people who buy from them should be aware that there are no guarantees about the quality of the goods and their rights are not protected.”