The students got the chance to explore famous sets from the films - including Diagon Alley.
They also created photographs of themselves riding in the magical flying car from "Harry Potter and the Chamber of Secrets".
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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.