Yes - there is a grandfather clause in trademark law - the first user of a trademark - as a source identifier - has "common law trademark rights." Mere ornamentation (use of a design or word, not as a trademark) is not protected under common law trademark rights. So the question is - who used the "trademark" properly in the first place - the city or the early vendors ?? Go visit a trademark attorney, bring facts and proof of early use. Then you will know if you call into "common law trademark rights."
Answered on Aug 24th, 2015 at 5:57 PM