Add React Native EU to upcoming conferences (#4465)

Add info about React Native EU to upcoming conferences. Organised by Callstack.

content/community/conferences.md

@@ -51,6 +51,15 @@ June 17 & 21, 2022. In-person in Amsterdam, Netherlands + remote first interacti
 
 [Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactsummit) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
 
+### React Native EU 2022: Powered by {callstack}
+September 1-2, 2022 - Remote event
+
+[Website](https://www.react-native.eu/?utm_campaign=React_Native_EU&utm_source=referral&utm_content=reactjs_community_conferences) -
+[Twitter](https://twitter.com/react_native_eu) -
+[Linkedin](https://www.linkedin.com/showcase/react-native-eu) -
+[Facebook](https://www.facebook.com/reactnativeeu/) - 
+[Instagram](https://www.instagram.com/reactnative_eu/)
+
 ### React India 2022 {#react-india-2022}
 September 22 - 24, 2022. In-person in Goa, India + remote (hybrid event)