“Goodbye forever brat summer”, Charli XCX tweeted this week, signalling an end to all things hot, sexy and frivolous. It may feel that summer is over as the cool weather starts to turn those verdant parks back to an Autumnal auburn, but that doesn’t mean you have to pack up your troubles in an old brat bag. There’s still plenty to smile about as the Venice Film Festival draws to a close with many films to get excited about such as Luca Guadagnino’s Queer, while over in Germany there’s not one, but two great festivals for pop fans, and a brilliant retrospective on at a contemporary gallery in G…