Events: structured data isn't formed correctly according to Google report

[AlexTr]

https://developers.google.com/search/docs/data-types/event

related code:

<div class="bx-tl-info bx-def-margin-sec-bottom bx-def-font-h3">
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  | <i class="sys-icon calendar-alt bx-def-margin-thd-right"></i> <span class="dtstart" title="2019-06-24T08:00:00+00:00">24 Jun 19</span>
  | </div>
  | <div class="bx-tl-info bx-def-margin-sec-bottom bx-def-font-h3">
  | <i class="sys-icon map-marker-alt bx-def-margin-thd-right"></i> <span class="location">Los Angeles, CA, United States</span>
  | </div>