No PEWG calls on Sept 9 nor Sept 16

Hi All,

I don't think we have sufficient topics for a call on September 9 so we 
won't have a call that day and I will not be available on September 16 
so we won't have a call that day either.

Please continue to work on open actions [1] and let's plan for a call on 
September 23.

-Thanks, AB

[1] <https://www.w3.org/2012/pointerevents/track/actions/open>