Conferences: add new conferences Change-Id: Icec514dc328cddd665a3068955e839a37c1fd741 Reviewed-on: https://go-review.googlesource.com/c/wiki/+/657856 Auto-Submit: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Commit-Queue: Ian Lance Taylor <iant@golang.org>