update dates

index.html

@@ -55,8 +55,6 @@ help support Mozilla.
       <section>
         <h2><a href="https://github.com/mozilla/devroadshow2017/blob/master/Cities.md" target="_blank">Upcoming Cities</a></h2>
         <ul>  
-          <li><strong>Apr 19, 2017</strong>: Columbus OH @ <a href="http://columbusjs.org/04-19-2017/mozilla-dev-roadshow.html" target="_blank">CBus</a></li> 
-          <li><strong>Apr 20, 2017</strong>: Chicago, IL @ <a href="https://generalassemb.ly/education/how-css-grid-is-reinventing-webpage-design/chicago/34896" target="_blank">General Assembly</a></li>
           <li><strong>Apr 25, 2017</strong>: London, UK @ <a href=
           "https://www.meetup.com/Mozilla-Developer-Roadshow-UK-Edition/events/238928357/?a=socialmedia" target="_blank">Twitter</a></li>
           <li><strong>Apr 29, 2017</strong>: Berlin, Germany @ <a href=
@@ -75,6 +73,8 @@ help support Mozilla.
       <section>
         <h2><a href="https://github.com/mozilla/devroadshow2017/blob/master/Cities.md" target="_blank">Past Cities</a></h2>
         <ul>
+          <li><strong>Apr 20, 2017</strong>: Chicago, IL @ <a href="https://generalassemb.ly/education/how-css-grid-is-reinventing-webpage-design/chicago/34896" target="_blank">General Assembly</a></li>
+          <li><strong>Apr 19, 2017</strong>: Columbus OH @ <a href="http://columbusjs.org/04-19-2017/mozilla-dev-roadshow.html" target="_blank">CBus</a></li> 
           <li><strong>Apr 06, 2017</strong>: Atlanta, GA @ <a href="https://generalassemb.ly/education/how-css-grid-is-reinventing-webpage-design/atlanta/34844" target="_blank">General Assembly</a></li>
           <li><strong>Mar 28, 2017</strong>: Austin, TX @ IBM</li>
           <li><strong>Mar 27, 2017</strong>: Austin, TX @ <a href="https://www.eventbrite.com/e/mozilla-developer-roadshow-presents-hack-on-open-source-workshop-tickets-32701486025" target="_blank">Galvanize</a></li>