Sydney’s gay pride street parade celebrates same-sex marriage, honors early activists.

REUTERS/Steven Saphore

About half a million people are expected to line Sydney’s streets on Saturday to celebrate the 40th anniversary of the Gay and Lesbian Mardi Gras, the first time the annual parade has taken place since Australia legalized same-sex marriage.

The event started in 1978 as a protest march for gay rights and the decriminalization of homosexuality but has since grown into a major tourist spectacle featuring leather, sequins, glitter, lasers and dance music.