What is the fine-grained topic of the following text: Millie Bobby Brown is heading to Australia next month as a guest of Converse, and you could win an opportunity meet Millie in Brisbane and customise your very own pair of White Chuck 70s, by sharing what it means for you to be a girl today. Only return the topic.
Winning a chance to meet Millie Bobby Brown in Australia and customise Converse shoes by sharing experiences of being a girl today.