Fix event header to re-implement offsite links
Fix event header to re-implement offsite links

When I refactored out the event_header partial, I didn't bring over the offsite link capability. This commit fixes this. The commit that broke it was dfc9062. This was identified in #76 by @davidasnider.


Former-commit-id: df2335a281cf4ba0cd03331700ec0dc0ebcc5c9f
gomex/devopsdays-web,gomex/devopsdays-web,gomex/devopsdays-web,gomex/devopsdays-web