Update conferences list based on 2020 COVID cancellations (#3144)

Disclaimer: I'm an organiser of React Summit, React Advanced London and React Day Berlin - changes proposed in this PR is a small effort to actualise the list of events next to updating our own event dates

Next to updating own conference dates, I've made following changes:

* Removed 2020 events that, based on the current information from their websites, are cancelled or postponed without a new date
* Moved 2020 events that have actually ran to the "past events" section
* Updated dates of some events in 2020 that have not announced their cancellation, but moved dates within this year

What I didn't do:

* I haven't added 2020 cancelled events with their assumed 2021 dates, as it's up to organizers to confirm those and re-add
* To stay consistent with point above - I'm also not adding our (GitNation - React Summit, React Advanced) cancelled event dates that moved to 2021
* Conferences that have a past dates, but has not clear statement on the website about cancellation have not been removed, but rather moved to "past events" section

The information is relevant as of today's date - during these hard times plans do change frequently, so some information may be outdated by the time this PR is merged. I'll be happy to provide amends until it's merged.

content/community/conferences.md

@@ -12,96 +12,31 @@ Do you know of a local React.js conference? Add it here! (Please keep the list c
 
 ## Upcoming Conferences {#upcoming-conferences}
 
-### Reactathon 2020 {#reactathon-2020}
-March 30 - 31, 2020 in San Francisco, CA
-
-[Website](https://www.reactathon.com) - [Twitter](https://twitter.com/reactathon) - [Facebook](https://www.facebook.com/events/575942819854160/)
-
-### React Summit - Remote Edition 2020 {#react-summit-remote-2020}
-3pm CEST time, April 17, 2020 - remote event
-
-[Website](https://remote.reactsummit.com) - [Twitter](https://twitter.com/reactamsterdam) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
-
-### React Day Bangalore 2020 {#react-day-bangalore-2020}
-April 25, 2020 in Bangalore, India
-
-[Website](https://reactday.in) - [Twitter](https://twitter.com/ReactDayIn) - [LinkedIn](https://www.linkedin.com/company/react-day/)
-
-### Byteconf React 2020 {#byteconf-react-2020}
-May 1, 2020. Streamed online on YouTube.
-
-[Website](https://www.bytesized.xyz) - [Twitter](https://twitter.com/bytesizedcode) - [YouTube](https://www.youtube.com/channel/UC046lFvJZhiwSRWsoH8SFjg)
-
-### ReactEurope 2020 {#reacteurope-2020}
-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 Finland 2020 {#react-finland-2020}
-May 26-29 in Helsinki, Finland
-
-[Website](https://react-finland.fi/) - [Twitter](https://twitter.com/ReactFinland)
-
-### React Next 2020 {#react-next-2020}
-June 15, 2020. Tel Aviv, Israel.
-
-[Website](https://react-next.com/) - [Twitter](https://twitter.com/reactnext) - [Facebook](https://www.facebook.com/ReactNext2016/)
-
-### React Loop 2020 {#react-loop-2020}
-June 19, 2020. Chicago, Illinois, USA.
-
-[Website](https://reactloop.com) - [Twitter](https://twitter.com/ReactLoop)
-
-### React Week NY 2020 {#react-week-ny-2020}
-July 17, 2020. New York City, USA.
-
-[Website](https://reactweek.nyc/) - [Twitter](https://twitter.com/reactweek) - [Facebook](https://www.facebook.com/reactweek)
-
-### React La Conferencia 2020 {#react-la-conferencia-2020}
-July 18, 2020. Medellín, Colombia.
-
-[Website](https://reactlaconf.co/) - [Twitter](https://twitter.com/reactlaconf)
-
-### Chain React 2020 {#chain-react-2020}
-July 29-30, 2020. Portland, Oregon, USA.
-
-[Website](https://infinite.red/ChainReactConf) - [Twitter](https://twitter.com/ChainReactConf)
-
-### render(ATL) 2020 {#render-atlanta-2020} 
-August 24-26, 2020. Atlanta, GA, USA.
-
-[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)
-
-### ComponentsConf 2020 {#components20}
-September 1, 2020 in Melbourne, Australia
-
-[Website](https://www.componentsconf.com.au/) - [Twitter](https://twitter.com/ComponentsConf) - [Facebook](https://www.facebook.com/ComponentsConf/) - [LinkedIn](https://www.linkedin.com/company/componentsconf/) - [YouTube](https://www.youtube.com/ComponentsConf)
-
 ### React Native EU 2020 {#react-native-eu-2020}
-September 5-6, 2020 in Wrocław, Poland
+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/)
 
-### React Summit Amsterdam 2020 {#react-summit-2020}
-September 8-11, 2020 in Amsterdam, The Netherlands
-
-[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactamsterdam) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
-
-### React Advanced 2020 {#react-advanced-2020}
-October 21-23, 2020 in London, UK
+### render(ATL) 2020 {#render-atlanta-2020} 
+September 13-15, 2020. Atlanta, GA, USA.
 
-[Website](https://reactadvanced.com) - [Twitter](http://twitter.com/reactadvanced) - [Facebook](https://www.facebook.com/ReactAdvanced) - [Videos](https://youtube.com/c/ReactConferences)
+[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)
 
-### React India 2020 {#react-india-2020}
-November 6, 2020 in Mumbai, India
+### React Summit 2020 {#react-summit-2020}
+7am PST / 1pm EST / 4pm CEST October 15-16, 2020 - remote event
 
-[Website](https://www.reactindia.io) - [Twitter](https://twitter.com/react_india) - [Facebook](https://www.facebook.com/ReactJSIndia/) - [LinkedIn](https://www.linkedin.com/showcase/14545585) - [YouTube](https://www.youtube.com/channel/UCaFbHCBkPvVv1bWs_jwYt3w/videos)
+[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.
+
+[Website](https://react-next.com/) - [Twitter](https://twitter.com/reactnext) - [Facebook](https://www.facebook.com/ReactNext2016/)
+
 ## Past Conferences {#past-conferences}
 
 ### React.js Conf 2015 {#reactjs-conf-2015}
@@ -129,7 +64,7 @@ February 22 & 23 in San Francisco, CA
 ### React Amsterdam 2016 {#react-amsterdam-2016}
 April 16 in Amsterdam, The Netherlands
 
-[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactamsterdam) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
+[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactsummit) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
 
 ### ReactEurope 2016 {#reacteurope-2016}
 June 2 & 3 in Paris, France
@@ -179,7 +114,7 @@ March 28th at the [QEII Centre, London](http://qeiicentre.london/)
 ### React Amsterdam 2017 {#react-amsterdam-2017}
 April 21st in Amsterdam, The Netherlands
 
-[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
+[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactsummit) - [Videos](https://youtube.com/c/ReactConferences)
 
 ### ReactEurope 2017 {#reacteurope-2017}
 May 18th & 19th in Paris, France
@@ -284,7 +219,7 @@ March 31 in Kiev, Ukraine
 ### React Amsterdam 2018 {#react-amsterdam-2018}
 April 13 in Amsterdam, The Netherlands
 
-[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactamsterdam) - [Facebook](https://www.facebook.com/reactamsterdam)
+[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactsummit) - [Facebook](https://www.facebook.com/reactamsterdam)
 
 ### React Finland 2018 {#react-finland-2018}
 April 24-26 in Helsinki, Finland
@@ -389,7 +324,7 @@ April 4-5, 2019 in Kraków, Poland
 ### React Amsterdam 2019 {#react-amsterdam-2019}
 April 12, 2019 in Amsterdam, The Netherlands
 
-[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactamsterdam) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
+[Website](https://reactsummit.com) - [Twitter](https://twitter.com/reactsummit) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
 
 ### React Finland 2019 {#react-finland-2019}
 April 24-26 in Helsinki, Finland
@@ -515,3 +450,23 @@ February 1-2, 2020 in Cologne, Germany
 February 27 & 28, 2020 in Sydney, Australia
 
 [Website](https://reactconfau.com/) - [Twitter](https://twitter.com/reactconfau) - [Facebook](https://www.facebook.com/reactconfau) - [Instagram](https://www.instagram.com/reactconfau/)
+
+### Reactathon 2020 {#reactathon-2020}
+March 30 - 31, 2020 in San Francisco, CA
+
+[Website](https://www.reactathon.com) - [Twitter](https://twitter.com/reactathon) - [Facebook](https://www.facebook.com/events/575942819854160/)
+
+### React Summit - Remote Edition 2020 {#react-summit-remote-2020}
+3pm CEST time, April 17, 2020 - remote event
+
+[Website](https://remote.reactsummit.com) - [Twitter](https://twitter.com/reactsummit) - [Facebook](https://www.facebook.com/reactamsterdam) - [Videos](https://youtube.com/c/ReactConferences)
+
+### Byteconf React 2020 {#byteconf-react-2020}
+May 1, 2020. Streamed online on YouTube.
+
+[Website](https://www.bytesized.xyz) - [Twitter](https://twitter.com/bytesizedcode) - [YouTube](https://www.youtube.com/channel/UC046lFvJZhiwSRWsoH8SFjg)
+
+### ReactEurope 2020 {#reacteurope-2020}
+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)