remove deprecated city and year frontmatter parameters

Former-commit-id: 51e27c90480a808a362b1fdc83fe54d3291e9544

Author: mattstratton

archetypes/event.md

@@ -1,4 +1,2 @@
 +++
-City = ""
-Year = ""
 +++

content/events/2016-chicago/conduct.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-06T21:17:08-06:00"
 title = "conduct"
 type = "event"

content/events/2016-chicago/contact.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-06T21:16:08-06:00"
 title = "contact"
 type = "event"

content/events/2016-chicago/location.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-06T21:17:00-06:00"
 title = "location"
 type = "event"

content/events/2016-chicago/program.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-06T21:28:07-06:00"
 title = "program"
 type = "event"

content/events/2016-chicago/proposals.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-06T21:28:14-06:00"
 title = "proposals"
 type = "event"

content/events/2016-chicago/propose.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-06T22:47:24-06:00"
 title = "propose"
 type = "event"

content/events/2016-chicago/registration.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-06T21:28:23-06:00"
 title = "registration"
 type = "event"

content/events/2016-chicago/sponsor.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-06T21:17:14-06:00"
 title = "sponsor"
 type = "event"

content/events/2016-chicago/welcome.md

@@ -1,6 +1,4 @@
 +++
-City = "Chicago"
-Year = "2016"
 date = "2016-03-04T17:36:05-06:00"
 title = "welcome"
 type = "event"

content/events/sample-event/contact.md

@@ -1,6 +1,4 @@
 +++
-City = ""
-Year = ""
 date = "2016-03-06T21:16:08-06:00"
 title = "contact"
 type = "event"

content/events/sample-event/program.md

@@ -1,6 +1,4 @@
 +++
-City = ""
-Year = ""
 date = "2016-03-06T21:28:07-06:00"
 title = "program"
 type = "event"