The Durham Miners' Gala — known locally as "the Big Meeting" — is held on the second Saturday of July and is the largest trade union event in the world. Colliery brass bands from across the North East march through the city streets each carrying their pit's silk banner, converging on the racecourse for speeches and entertainment. Even if you have no particular interest in labour history, it is a remarkable spectacle: the sound of twenty brass bands playing simultaneously in a narrow city-centre street has to be heard to be believed.
The Gala is free to attend and entirely community-organised. The streets fill from around 9am as the processions begin; the speeches on the racecourse run from late morning. The pubs open early and stay packed all day. If you're visiting Durham in July and the dates align, don't miss it.