Sample JSON-LD for an event

event.js

<script type='application/ld+json'> 
{
  "@context": "https://www.schema.org",
  "@type": "Event",
  "name": "Launch Party",
  "url": "http://www.example.com/launch-party",
  "description": "We're excited to announce the launch party for our newest app!",
  "startDate": "10/05/2015 12:00PM",
  "endDate": "10/05/2015 02:00PM",
  "location": {
    "@type": "Place",
    "name": "Joe's Party Palace",
    "sameAs": "http://www.example.com",
    "address": {
      "@type": "PostalAddress",
      "streetAddress": "100 Main Street",
      "addressLocality": "Seattle",
      "addressRegion": "WA",
      "postalCode": "98101",
      "addressCountry": "USA"
    }
  },
  "offers": {
    "@type": "Offer",
    "description": "an offer description",
    "url": "http://www.example.com",
    "price": "$9.99"
  }
}
 </script>

cheers!