Update Tetrapod-2018.md

events/Tetrapod-2018.md

@@ -27,7 +27,7 @@ Of particular interest are
 
 #### Format
 
-- There will be 8 invited speakers, each of which will be asked to present a specific topic.
+- There will be 6 invited speakers, each of which will be asked to present a specific topic.
 - Each speaker will give a 15-minute presentation on that topic that is followed by a 
      30-minute discussion session.
 - There will not be a call for papers or other contributions.