Here is what is says on the page for that session
Join us in an open dialog with members of the SQL Server 2016 Program Management team. Don't miss this unique opportunity to ask the hard questions. Seating is limited to 50 so arrive early. Chalk Talk sessions are not recorded.As you can see this session sits only 50 people, so make sure to make a note of that, this way you know to get there early
Some other sessions are also going to be either very popular or they might be in a smaller room, so add those sessions to your schedule first.
You can see all the sessions here: http://www.sqlpass.org/summit/2016/Sessions/Schedule.aspx
See you at the PASS summit in October