“Happy la-di-da” was the singsong greeting heard on Sydney’s Oxford Street last March: rhyming slang commemorating Mardi Gras, the city’s final mass event before Covid-19 hit. “Gay Christmas”, as it’s colloquially called, will look different this year – 35,000 ticket holders will watch the parade at the Sydney Cricket Ground, a more controllable environment than Oxford Street, traditionally lined with some 200,000 spectators. For 78er Kate Rowe,...