Speaking to our reporter, Liz Wickham, the travellers say they're Irish and have nowhere else to go.
The six caravans are parked on football pitches, preventing some of the regular Saturday morning matches from being played.
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The pub owner said the sign is a nod at having a bit of fun in support of them and celebrating their relationship and the wedding.
A 61-year-old woman was taken to hospital with head injuries after the incident in Islington, north London.
Assema Kedir Habib spoke at the commemoration of her brother Hashim Kedir and his family.