Merge pull request #199 from rhauck/angel-slides

added Angel's keynote slide deck
when there are no upcoming events, only expand the past events sidebar in the main events index page
Merge pull request #200 from rhauck/event-sidebar

when there are no upcoming events, only expand the past events sidebar i...
x-post shenzhen recap blog
Merge pull request #201 from rhauck/xpost-shenzhen

x-post shenzhen recap blog