What is the fine-grained topic of the following text: Titled 'Prom', Erin Quinn (Saoirse Monica Jackson) and the gang strutted their stuff at a school formal but the star of the show was the way in which Derry Girls writer and creator, Lisa McGee, introduced the peace process to a global audience. Only return the topic.
Derry Girls' depiction of the peace process in the 'Prom' episode