Updates to conferences agenda in 2020-21 (reactjs#3287)

* update React Summit time and add 2021 date
* move past events to the bottom
* Update React ATL date to 2021
* React next is now remote
* remove React Day Berlin

Author: robhrt7

content/community/conferences.md

@@ -12,30 +12,25 @@ Do you know of a local React.js conference? Add it here! (Please keep the list c
 
 ## Upcoming Conferences {#upcoming-conferences}
 
-### React Native EU 2020 {#react-native-eu-2020}
-September 3-4, 2020 - remote event
+### React Summit 2020 {#react-summit-2020}
+October 15-16, 2020, 7am PST / 10am EST / 4pm CEST - remote event
 
-[Website](https://www.react-native.eu/) - [Twitter](https://twitter.com/react_native_eu) - [Facebook](https://www.facebook.com/reactnativeeu/) - [YouTube](https://www.youtube.com/watch?v=m0GfmlGFh3E&list=PLZ3MwD-soTTHy9_88QPLF8DEJkvoB5Tl-) - [Instagram](https://www.instagram.com/reactnative_eu/)
+[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactsummit) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
 
-### render(ATL) 2020 {#render-atlanta-2020} 
-September 13-15, 2020. Atlanta, GA, USA.
+### React Next 2020 {#react-next-2020}
+December 1-2, 2020 - remote event
 
-[Website](https://renderatl.com) - [Twitter](https://twitter.com/renderATL) - [Instagram](https://www.instagram.com/renderatl/) - [Facebook](https://www.facebook.com/renderatl/) - [LinkedIn](https://www.linkedin.com/company/renderatl)
+[Website](https://react-next.com/) - [Twitter](https://twitter.com/reactnext) - [Facebook](https://www.facebook.com/ReactNext2016/)
 
-### React Summit 2020 {#react-summit-2020}
-7am PST / 1pm EST / 4pm CEST October 15-16, 2020 - remote event
+### React Summit 2021 {#react-summit-2021}
+June 2-4, 2021. Amsterdam, The Netherlands
 
 [Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactsummit) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
 
-### React Day Berlin 2020 {#react-day-berlin-2020}
-November 25-27, 2020 in Berlin, Germany
-
-[Website](https://reactday.berlin) - [Twitter](https://twitter.com/reactdayberlin) - [Facebook](https://www.facebook.com/reactdayberlin/) - [Videos](https://www.youtube.com/reactdayberlin)
-
-### React Next 2020 {#react-next-2020}
-December 1, 2020. Tel Aviv, Israel.
+### render(ATL) 2021 {#render-atlanta-2021} 
+September 13-15, 2021. Atlanta, GA, USA
 
-[Website](https://react-next.com/) - [Twitter](https://twitter.com/reactnext) - [Facebook](https://www.facebook.com/ReactNext2016/)
+[Website](https://renderatl.com) - [Twitter](https://twitter.com/renderATL) - [Instagram](https://www.instagram.com/renderatl/) - [Facebook](https://www.facebook.com/renderatl/) - [LinkedIn](https://www.linkedin.com/company/renderatl)
 
 ## Past Conferences {#past-conferences}
 
@@ -470,3 +465,8 @@ May 1, 2020. Streamed online on YouTube.
 May 14-15, 2020 in Paris, France
 
 [Website](https://www.react-europe.org) - [Twitter](https://twitter.com/ReactEurope) - [Facebook](https://www.facebook.com/ReactEurope) - [Videos](https://www.youtube.com/c/ReacteuropeOrgConf)
+
+### React Native EU 2020 {#react-native-eu-2020}
+September 3-4, 2020 - remote event
+
+[Website](https://www.react-native.eu/) - [Twitter](https://twitter.com/react_native_eu) - [Facebook](https://www.facebook.com/reactnativeeu/) - [YouTube](https://www.youtube.com/watch?v=m0GfmlGFh3E&list=PLZ3MwD-soTTHy9_88QPLF8DEJkvoB5Tl-) - [Instagram](https://www.instagram.com/reactnative_eu/)