Fix: add date meta info for some event pages

events/2011.md

 [[!meta title="Events - 2011"]]
+[[!meta date="2011-01-01 12:00:00-0300"]]
 
 [[!inline pages="page(events/2011*)" archive="yes"]]

events/2012.md

 [[!meta title="Events - 2012"]]
+[[!meta date="2012-01-01 12:00:00-0300"]]
 
 [[!inline pages="page(events/2012*)" archive="yes"]]

events/2013.md

 [[!meta title="Events - 2013"]]
+[[!meta date="2013-01-01 12:00:00-0300"]]
 
 [[!inline pages="page(events/2013*)" archive="yes"]]

events/2014.md

 [[!meta title="Events - 2014"]]
+[[!meta date="2014-01-01 12:00:00-0300"]]
 
 [[!inline pages="page(events/2014*)" archive="yes"]]

events/2015.md

 [[!meta title="Events - 2015"]]
+[[!meta date="2015-01-01 12:00:00-0300"]]
 
 [[!inline pages="page(events/2015*)" archive="yes"]]

events/2017.md

 [[!meta title="Events - 2017"]]
+[[!meta date="2017-01-01 12:00:00-0300"]]
 
 [[!inline pages="page(events/2017*)" archive="yes"]]