When I share a link to an event page via a social network then the auto-generated preview of the link shows the event time in the Central European Timezone without even mentioning the time zone.
For example, this is a preview of an event scheduled for 11am PDT on a Slack channel:

If you are a global company then this behavior is quite confusing for a majority of your users.
I’m not sure it’s technically possible to make the preview show the right time zone for each end user as they are usually generated from the og:title HTML meta tag. However, showing it with the timezone indicator (using the timezone specific by the user who published the event), not showing the time at all, option to edit pre-generated og:title, or simply reusing the actual event name for og:title without any modifications would be much better.
You can also notice that the event name in the screenshot above repeats the event date which is clearly not ideal. This is because we have a series of online events named GoodData Office Hours. In order to distinguish individual events in the Events widget on the community homepage, I have included the event date in the name of the event. Unfortunately, it leads to a duplicate date in the event preview as you can see on the screenshot.
Let me also share a minor problem with the events admin UI. When I was creating a new event, I wanted to use the Pacific time (UTC-7 for daylight saving time, otherwise UTC-8). When I typed “pacific”, the only option was Pacific/Honolulu (UTC-10) which I didn’t initially notice. The only applicable option was America/Los_Angeles which was not immediately obvious because the timezones are ordered alphabetically rather by the timezone offset.