LONDON — Thousands of women turned cities in England, Northern Ireland, Scotland and Wales into rivers of green, white and violet on Sunday to mark 100 years since the first women won the right to vote in Britain.

Wearing scarves in the colors of the suffragette movement that fought for female political rights, women marched through London, Belfast, Edinburgh and Cardiff in events that were part artworks, part parades.

The milestone they observed was the enactment of the Representation of the People Act, which in 1918 granted property-owning British women over age 30 the right to vote. It would be another decade before women in Britain would have the same voting rights as men.