Update closing-keynote.md

Author: AmandaPerino

_world_sessions/2024/day-1/closing-keynote.md

@@ -1,10 +1,14 @@
 ---
 layout: world/2024/session
-title: Closing Keynote
-speaker: TBD
+title: Matz & DHH Fireside chat, hosted by Tobias Lütke
+speaker: yukihiro-matz.md
+second_speaker: david-hansson.md
 time: 16:30 - 17:30
-location: Track 1
 running_order: 14
+location: Track 1
+multiple_speakers: true 
 ---
 
-More information coming soon.
+We are pleased to welcome Ruby creator and special guest Yukihiro Matsumoto (Matz) to the Rails World stage for a fireside chat with Rails creator David Heinemeier Hansson (DHH). Together on stage for the very first time!
+
+Hosted by Shopify founder Tobias Lütke, this is sure to be a conversation you don’t want to miss.