Adds React Advanced London 2024 (#7127)

PR to add Radv 2024 conference

Author: PixelsCommander

src/content/community/conferences.md

@@ -55,6 +55,11 @@ October 18, 2024. In-person in Brussels, Belgium (hybrid event)
 
 [Website](https://www.react.brussels/) - [Twitter](https://x.com/BrusselsReact)
 
+### React Advanced London 2024 {/*react-advanced-london-2024*/}
+October 25 & 28, 2024. In-person in London, UK + online (hybrid event)
+
+[Website](https://reactadvanced.com/) - [Twitter](https://x.com/reactadvanced)
+
 ### React Africa 2024 {/*react-africa-2024*/}
 November 29, 2024. In-person in Casablanca, Morocco (hybrid event)